{"id":14445,"date":"2026-11-13T09:28:57","date_gmt":"2026-11-13T09:28:57","guid":{"rendered":"https:\/\/www.cigatisolutions.com\/blog\/?p=14445"},"modified":"2026-11-13T09:28:58","modified_gmt":"2026-11-13T09:28:58","slug":"migrate-hcl-domino-to-microsoft-365","status":"publish","type":"post","link":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/","title":{"rendered":"Migrate HCL Domino to Microsoft 365: Complete Migration Guide"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;14445&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Migrate HCL Domino to Microsoft 365: Complete Migration Guide&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n<p>If your company still runs mail on HCL Domino, sooner or later someone will ask when you plan to move to the cloud. Licensing renewals, a shrinking pool of Notes administrators, and the pull of Teams and SharePoint all push in the same direction. The best thing is that you can migrate HCL Domino to Microsoft 365 without losing mail, and you do not need a weekend of panic to do it. The catch is that Domino is not a plain mail server, so the plan has to account for things a standard mailbox move never touches.<\/p>\n<p>This guide walks through the three realistic ways to handle the job, what each one can and cannot carry across, and how to cut over without breaking mail flow. It applies whether you are migrating from HCL Domino (Lotus Notes) to Microsoft 365 for 20 users or 2,000.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Why_Teams_Migrate_HCL_Domino_to_Office_365\" >Why Teams Migrate HCL Domino to Office 365<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#What_to_Sort_Out_Before_You_Migrate\" >What to Sort Out Before You Migrate<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Methods_to_Migrate_HCL_Domino_to_Microsoft_365\" >Methods to Migrate HCL Domino to Microsoft 365<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Method_1_IMAP_Migration_Batch\" >Method 1: IMAP Migration Batch<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Disadvantages_of_Manual_Method\" >Disadvantages of Manual Method:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Method_2_Convert_NSF_to_PST_Then_Import\" >Method 2: Convert NSF to PST, Then Import<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Method_3_Professional_Way_to_Migrate_HCL_Domino_to_Microsoft_365\" >Method 3: Professional Way to Migrate HCL Domino to Microsoft 365<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#What_it_offers_for_a_Domino_project\" >What it offers for a Domino project:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#How_to_Migrate_HCL_Domino_to_Office_365_in_Simple_Steps\" >How to Migrate HCL Domino to Office 365 in Simple Steps:<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Domino-Specific_Problems_to_Plan_For_Migrating_from_HCL_Domino_to_Microsoft_365\" >Domino-Specific Problems to Plan For Migrating from HCL Domino to Microsoft 365<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Cutover_DNS_and_Mail_Flow\" >Cutover: DNS and Mail Flow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Post-Migration_Validation\" >Post-Migration Validation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Mistakes_That_Cause_the_Most_Rework\" >Mistakes That Cause the Most Rework<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Final_Thoughts\" >Final Thoughts<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Why_Teams_Migrate_HCL_Domino_to_Office_365\"><\/span>Why Teams Migrate HCL Domino to Office 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li aria-level=\"1\"><strong>Collaboration tools in one place<\/strong>: Outlook, Teams, OneDrive and SharePoint share one identity, so chat, files and calendars stop living in separate silos.<\/li>\n<li aria-level=\"1\"><strong>Less server upkeep<\/strong>: There are no Domino servers to patch, no replication schedules to babysit and no NSF files to compact.<\/li>\n<li aria-level=\"1\"><strong>Easier hiring<\/strong>: Finding people who know Outlook and the Microsoft 365 admin center is far simpler than finding Notes specialists.<\/li>\n<li aria-level=\"1\"><strong>Better mobile and remote access<\/strong>: Users get the same mailbox on a phone, a browser or a desktop client without a VPN.<\/li>\n<li aria-level=\"1\"><strong>Centralised security<\/strong>: Conditional access, MFA, retention labels and audit logs are managed from one console.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"What_to_Sort_Out_Before_You_Migrate\"><\/span>What to Sort Out Before You Migrate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li aria-level=\"1\"><strong>Take inventory: Export the Domino Directory to a spreadsheet: user names, internet addresses, mail file paths and mail file sizes. The size column tells you how long each batch will really take.<\/strong><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Find the hidden mail: Local archives, replicas on laptops and mail-in databases rarely show up on the server list. Ask users where their archive NSF files live.<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Decide what happens to encrypted mail: Messages encrypted with a Notes ID can only be read by that user. Plan for them to be decrypted before the move.<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Create the Microsoft 365 side: Add users, assign licences and confirm every user has a mailbox. Verify your domain in the tenant.<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Lower the DNS TTL: Drop the TTL on your MX record to a few minutes at least 48 hours before cutover, so the switch takes effect quickly.<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Back up everything: Keep a copy of every NSF file and the Domino Directory. Do not touch the source until you have verified the destination.<\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\">Pilot with a few mailboxes: Pick a mix: a light user, a heavy user with 20 GB of mail, and someone with a lot of calendar entries.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Methods_to_Migrate_HCL_Domino_to_Microsoft_365\"><\/span>Methods to Migrate HCL Domino to Microsoft 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>There is no single right method to migrate data. Your data volume, your need for calendars and contacts, &amp; your timeline decide which method suits you.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Method_1_IMAP_Migration_Batch\"><\/span>Method 1: IMAP Migration Batch<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>This is the Microsoft route. Exchange Online connects to your Domino server via IMAP. Pulls mail into the matching Microsoft 365 mailbox. Follow the steps to perform the migration:<\/p>\n<ol>\n<li aria-level=\"1\">On the Domino server, make sure the IMAP task is running &amp; that your users&#8217; mail files are enabled for IMAP. Each person also needs an Internet password in their Person document.<\/li>\n<li aria-level=\"1\">Confirm the IMAP service is reachable from the internet on port 993 (SSL\/TLS) or 143, and that the server presents a valid, trusted certificate.<\/li>\n<li aria-level=\"1\">In the Microsoft 365 admin center, create the user accounts and assign licences.<\/li>\n<li aria-level=\"1\">Open the Exchange admin center and go to <strong>Migration<\/strong>.<\/li>\n<li aria-level=\"1\">Create an IMAP migration endpoint. Enter the Domino server name, port and encryption setting, then test the connection.<\/li>\n<li aria-level=\"1\">Prepare a CSV file with three required columns: EmailAddress, UserName and Password. Each row maps a Microsoft 365 mailbox to its Domino login.<\/li>\n<li aria-level=\"1\">Create a new migration batch, choose IMAP migration, select the endpoint and upload the CSV.<\/li>\n<li aria-level=\"1\">Start the batch and watch the status. Failed rows show an error you can act on.<\/li>\n<li aria-level=\"1\">When the sync completes, switch the MX record and complete the batch.<\/li>\n<\/ol>\n<h4><span class=\"ez-toc-section\" id=\"Disadvantages_of_Manual_Method\"><\/span><strong><em>Disadvantages of Manual Method:<\/em><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li aria-level=\"1\">It moves mail only. Calendars, contacts, tasks and journal entries stay behind.<\/li>\n<li aria-level=\"1\">Domino has no easy administrator-level IMAP login, so you typically need each user&#8217;s Internet password or a temporary reset.<\/li>\n<li aria-level=\"1\">Microsoft documents limits on item count and item size for IMAP migrations, so very large or oversized messages may be skipped. Check the current figures before you start.<\/li>\n<li aria-level=\"1\">Local archives never travel, because they are not on the server.<\/li>\n<li aria-level=\"1\">Encrypted Notes messages arrive unreadable or not at all.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Method_2_Convert_NSF_to_PST_Then_Import\"><\/span><strong>Method 2: Convert NSF to PST, Then Import<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The second route treats each mail file as a data source rather than a live mailbox. You convert the NSF files to PST format and load the PST files into Exchange Online.<\/p>\n<p><strong>The general flow:<\/strong><\/p>\n<ol>\n<li aria-level=\"1\">Collect the NSF files from the Domino server and from user machines.<\/li>\n<li aria-level=\"1\">Convert each NSF to PST. You can export through the Notes client, or use a converter that reads NSF files directly. Our walkthrough on<a href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-lotus-notes-to-outlook\/\" target=\"_blank\" rel=\"noopener\"> how to migrate Lotus Notes to Outlook<\/a> covers the conversion side in detail, and<a href=\"https:\/\/www.cigatisolutions.com\/blog\/open-nsf-file-in-outlook\/\" target=\"_blank\" rel=\"noopener\"> opening an NSF file in Outlook<\/a> explains why NSF files cannot simply be attached to Outlook as they are.<\/li>\n<li aria-level=\"1\">Open the resulting PST in Outlook and drag folders into the Microsoft 365 mailbox, or use the Microsoft Purview import service for bulk loads.<\/li>\n<li aria-level=\"1\">Compare folder counts between source and destination.<\/li>\n<\/ol>\n<p>This approach works well when you need calendars and contacts, when you are dealing with archives, or when the Domino server is already switched off. The trade-off is time: converting and loading hundreds of files takes planning, and each PST needs checking.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Method_3_Professional_Way_to_Migrate_HCL_Domino_to_Microsoft_365\"><\/span>Method 3: Professional Way to Migrate HCL Domino to Microsoft 365<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"migrate-btn-n my-4\">\n<p>The <strong><em>Cigati <\/em><\/strong><a href=\"https:\/\/www.cigatisolutions.com\/imap-mail-backup\/\" target=\"_blank\" rel=\"noopener\"><strong><em>IMAP Backup Tool<\/em><\/strong><\/a> sits between the two methods above. It connects to the Domino IMAP service the way Exchange Online does, but you run it from an admin PC and it writes straight into the Microsoft 365 mailbox. That means no migration endpoint and no CSV batch to maintain. It can also save the same mail to a local PST first, so you end up with a backup of every Domino mailbox and a migrated copy from one session.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"What_it_offers_for_a_Domino_project\"><\/span><strong><em>What it offers for a Domino project:<\/em><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li aria-level=\"1\">Migrates IMAP mailboxes to Microsoft 365 (and to Gmail or Google Workspace if part of the company is going elsewhere).<\/li>\n<li aria-level=\"1\">Saves mail to <strong><em>PST, MBOX, EML, MSG, PDF, CSV, DOC<\/em><\/strong> and <strong><em>DOCX<\/em><\/strong>, which is handy for archive copies and compliance requests.<\/li>\n<li aria-level=\"1\">Keeps the original folder hierarchy.<\/li>\n<li aria-level=\"1\">Lets you preview the account&#8217;s folders before anything moves.<\/li>\n<li aria-level=\"1\">Lets you export with or without attachments, or save attachments separately.<\/li>\n<\/ul>\n<div class=\"row justify-content-center mac-win-tab mt-3 mb-5\">\n<div class=\"col-md-6\">\n<ul id=\"myTab\" class=\"nav nav-tabs justify-content-center\" role=\"tablist\">\n<li class=\"nav-item\" role=\"presentation\"><button id=\"home-tab\" class=\"nav-link bg-transparent px-4 active\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#home\" aria-controls=\"home\" aria-selected=\"true\"><i class=\"icon-windows\"><\/i> Windows<\/button><\/li>\n<li class=\"nav-item\" role=\"presentation\"><button id=\"profile-tab\" class=\"nav-link bg-transparent px-4\" role=\"tab\" type=\"button\" data-toggle=\"tab\" data-target=\"#profile\" aria-controls=\"profile\" aria-selected=\"false\"><i class=\"icon-apple\"><\/i>Mac<\/button><\/li>\n<\/ul>\n<div id=\"myTabContent\" class=\"tab-content\">\n<div id=\"home\" class=\"tab-pane fade active show\" role=\"tabpanel\" aria-labelledby=\"home-tab\"><span class=\"block_btn\"><a class=\"primary-btn\" href=\"https:\/\/www.cigatisolutions.com\/demo-version\/Cigati-IMAP-Backup-win.exe\"><i class=\"icon-windows\"><\/i> Download Now<\/a> <a class=\"secondary-btn\" href=\"https:\/\/www.cigatisolutions.com\/imap-mail-backup\/purchase-now.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<div id=\"profile\" class=\"tab-pane fade\" role=\"tabpanel\" aria-labelledby=\"profile-tab\"><span class=\"block_btn\"><a class=\"primary-btn\" href=\"https:\/\/www.cigatisolutions.com\/demo-version\/Cigati-imap-backup-for-mac.dmg\"><i class=\"icon-apple\"><\/i> Download Now<\/a> <a class=\"secondary-btn\" href=\"https:\/\/www.cigatisolutions.com\/mac\/imap-backup\/purchase-now.php\" target=\"_blank\" rel=\"noopener\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h4><span class=\"ez-toc-section\" id=\"How_to_Migrate_HCL_Domino_to_Office_365_in_Simple_Steps\"><\/span><strong><em>How to Migrate HCL Domino to Office 365 in Simple Steps:<\/em><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ol>\n<li aria-level=\"1\">Install the tool on a Windows machine that can reach the Domino server, &amp; pick IMAP as the source.<\/li>\n<li aria-level=\"1\">Enter the Domino hostname, the IMAP port, the user&#8217;s email address and their Internet password.<\/li>\n<li aria-level=\"1\">Wait for the folder tree to load, then browse it to confirm you are in the right mailbox.<\/li>\n<li aria-level=\"1\">Tick the folders you want. Take a PST backup first if you want a safety copy.<\/li>\n<li aria-level=\"1\">Choose Microsoft 365 as the destination and sign in to the target user&#8217;s account.<\/li>\n<li aria-level=\"1\">Start the process, watch progress, then repeat for the next mailbox.<\/li>\n<\/ol>\n<p>Treat it like the IMAP route when it comes to scope. Since it reads mail over IMAP, calendars, contacts and local archives still need the NSF to PST route. It also still needs the IMAP service enabled on Domino and a working Internet password for each user. Test it on one pilot mailbox first and compare the results before you start on the bulk run.<\/p>\n<p>If your goal is mail alone and you can collect the Internet passwords, either IMAP route works, and Cigati IMAP Backup Tool spares you the endpoint and batch setup while giving you a PST backup on the side. If you also need calendars, contacts and archives, the NSF to PST route is the safer fit. When you are moving many accounts at once, the planning advice in our guide to <a href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-multiple-email-accounts-to-office-365\/\" target=\"_blank\" rel=\"noopener\"><strong><em>migrating multiple email accounts to Office 365<\/em><\/strong><\/a> is worth a read, since the batching logic is similar regardless of the source system.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Domino-Specific_Problems_to_Plan_For_Migrating_from_HCL_Domino_to_Microsoft_365\"><\/span>Domino-Specific Problems to Plan For Migrating from HCL Domino to Microsoft 365<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li aria-level=\"1\"><strong>Encrypted mail<\/strong>: Notes encryption is tied to the user&#8217;s ID file. Ask users to decrypt important messages beforehand, or use a method that accepts the ID file during conversion.<\/li>\n<li aria-level=\"1\"><strong>Doclinks<\/strong>: A Notes doclink points to a document inside a Notes database. After migration it will not open. Tell users now so they are not surprised later.<\/li>\n<li aria-level=\"1\"><strong>Rich text formatting<\/strong>: Notes rich text can include embedded objects, tables and inline images. Most of it converts cleanly, but sample a few complicated messages.<\/li>\n<li aria-level=\"1\"><strong>Groups and mail-in databases<\/strong>: Domino groups map best to distribution lists or Microsoft 365 groups, and mail-in databases such as a shared helpdesk inbox map to shared mailboxes. Room and resource reservations become room and equipment mailboxes.<\/li>\n<li aria-level=\"1\"><strong>Domino applications<\/strong>: Workflow databases do not move with mail. Decide whether to rebuild them with SharePoint lists, Power Apps or Teams, or retire them.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Cutover_DNS_and_Mail_Flow\"><\/span>Cutover: DNS and Mail Flow<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Once your pilot and bulk batches look right, move the mail routing.<\/p>\n<ol>\n<li aria-level=\"1\">Point the MX record to your Exchange Online Protection address (it looks like <em>yourdomain-com.mail.protection.outlook.com<\/em>).<\/li>\n<li aria-level=\"1\">Add the Autodiscover CNAME record pointing to <em>autodiscover.outlook.com<\/em>.<\/li>\n<li aria-level=\"1\">Update the SPF record to include <em>spf.protection.outlook.com<\/em>.<\/li>\n<li aria-level=\"1\">Turn on DKIM signing for the domain in the Microsoft 365 Defender portal.<\/li>\n<li aria-level=\"1\">Send test messages in both directions, that include to external addresses at Gmail and Yahoo, and check that nothing lands in spam.<\/li>\n<li aria-level=\"1\">Run a final incremental sync to catch anything that arrived during the switch.<\/li>\n<\/ol>\n<p>During a phased migration, keep Domino routing in place for users who have not moved yet, so mail for both groups keeps flowing.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Post-Migration_Validation\"><\/span>Post-Migration Validation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Do not decommission anything until you have checked the results.<\/p>\n<ul>\n<li aria-level=\"1\">Compare item counts per folder between the NSF and the new mailbox.<\/li>\n<li aria-level=\"1\">Open a sample of messages with attachments, inline images and long threads.<\/li>\n<li aria-level=\"1\">Confirm that received dates in Sent Items &amp; Inbox match the original.<\/li>\n<li aria-level=\"1\">Check that recurring meetings land on the right days and time zones.<\/li>\n<li aria-level=\"1\">Review the migration report for skipped or failed items and chase every one.<\/li>\n<li aria-level=\"1\">Keep the Domino server and NSF backups available, read-only, for 30 to 90 days.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Mistakes_That_Cause_the_Most_Rework\"><\/span>Mistakes That Cause the Most Rework<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li aria-level=\"1\">Skipping the pilot batch and discovering authentication problems on 200 mailboxes at once.<\/li>\n<li aria-level=\"1\">Forgetting local archives, then hearing from users a week later that years of mail are missing.<\/li>\n<li aria-level=\"1\">Cutting over MX records without lowering the TTL first.<\/li>\n<li aria-level=\"1\">Running two overlapping jobs against the same mailbox, which creates duplicates.<\/li>\n<li aria-level=\"1\">Deleting the source too early.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Final_Thoughts\"><\/span>Final Thoughts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Migrate HCL Domino to Microsoft 365 is less about the copy and more about preparation. If you inventory your mail files, decide how to handle encrypted messages and archives, pilot with a handful of mailboxes and validate before you decommission, the migration is quite manageable. Choose IMAP when you only need mail, either through Microsoft&#8217;s batch or through Cigati IMAP Backup Tool if you prefer a desktop workflow with a PST backup. Whichever way you go, take backups first and keep Domino alive until the last user confirms their data is complete.<\/p>\n<div class=\"faq-n my-4\">\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<div class=\"schema-faq wp-block-yoast-faq-block\">\u00a0\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1794561330433\"><strong class=\"schema-faq-question\"><strong>Q1. Can an IMAP migration move my Domino calendars and contacts?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. No. IMAP only carries mail folders and their messages. Calendars, contacts and tasks need a different route, such as exporting them from Notes, converting the NSF to PST, or using a tool that reads those items from the NSF directly.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561331820\"><strong class=\"schema-faq-question\"><strong>Q2. Why does the IMAP endpoint test fail when connecting to my Domino server?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. The usual causes are an IMAP task that is not running, a firewall blocking port 993 or 143 from Microsoft&#8217;s servers, an untrusted or expired TLS certificate, or a wrong hostname. Test the connection from outside your network first, then check the certificate chain.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561333075\"><strong class=\"schema-faq-question\"><strong>Q3. Users get an authentication error even though the endpoint works. What now?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Check that the Person document has an Internet password set, because the Notes ID password does not work for IMAP. Make sure the UserName column in the CSV holds the Domino IMAP login and not the Microsoft 365 address, and that the password has no trailing spaces.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561333595\"><strong class=\"schema-faq-question\"><strong>Q4. How do I migrate Notes local archive files?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Archives live on user machines, not the server, so IMAP cannot see them. Collect the archive NSF files, convert them to PST or process them with an NSF migration tool, and import them into the matching mailbox, or into the user&#8217;s online archive if the mailbox is large.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561334795\"><strong class=\"schema-faq-question\"><strong>Q5. Do I need the Notes client installed to convert NSF files?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. It depends on the method. Exporting through Notes itself needs the client and a working ID. Tools that parse NSF files on their own do not need it, which makes them easier to run on a separate admin machine.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561335940\"><strong class=\"schema-faq-question\"><strong>Q6. How are encrypted Domino messages handled?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans.<\/strong> They stay locked unless they are decrypted with the owner&#8217;s ID file. Either have users decrypt critical messages inside Notes first, or use a conversion method that accepts the ID and password during processing. Test this on a sample before you rely on it.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561457467\"><strong class=\"schema-faq-question\"><strong>Q7. What should I do with mailboxes larger than the Exchange Online quota?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Mailbox limits depend on the licence, commonly 50 GB or 100 GB. For heavier users, enable the online archive mailbox and split the data by date range, so older mail goes into the archive and recent mail stays in the primary mailbox.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561484403\"><strong class=\"schema-faq-question\"><strong>Q8. How can I avoid duplicate items if a batch has to be re-run?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Never start two jobs against the same destination at the same time. Choose Cigati IMAP Backup Tool that skips items already migrated, and use date filters to limit a re-run to the gap. After completion, sort by subject and date in a few large folders to spot repeats.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1794561504259\"><strong class=\"schema-faq-question\"><strong>Q9. Can I take a PST backup of a Domino mailbox before migrating it with Cigati IMAP Backup Tool?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Yes, provided the mailbox is reachable over IMAP. The tool can save mail to PST, MBOX, EML, MSG and PDF among other formats, so you can export a local copy first and then migrate the same account to Microsoft 365. Keep that backup until your validation checks are finished.<\/p> <\/div> <\/div>\n\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>If your company still runs mail on HCL Domino, sooner or later someone will ask when you plan to move<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/\">Read More<\/a><\/p>\n","protected":false},"author":16,"featured_media":14446,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[],"class_list":["post-14445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-management-migration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Migrate HCL Domino to Microsoft 365: Complete Migration Guide<\/title>\n<meta name=\"description\" content=\"Migrate HCL Domino to Microsoft 365 effortlessly. 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She specializes in content optimization, website growth, and practical SEO strategies that improve visibility, engagement, and organic reach.\",\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/author\\\/khushi123\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561330433\",\"position\":1,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561330433\",\"name\":\"Q1. Can an IMAP migration move my Domino calendars and contacts?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. No. IMAP only carries mail folders and their messages. Calendars, contacts and tasks need a different route, such as exporting them from Notes, converting the NSF to PST, or using a tool that reads those items from the NSF directly.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561331820\",\"position\":2,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561331820\",\"name\":\"Q2. Why does the IMAP endpoint test fail when connecting to my Domino server?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. The usual causes are an IMAP task that is not running, a firewall blocking port 993 or 143 from Microsoft's servers, an untrusted or expired TLS certificate, or a wrong hostname. Test the connection from outside your network first, then check the certificate chain.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561333075\",\"position\":3,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561333075\",\"name\":\"Q3. Users get an authentication error even though the endpoint works. What now?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. Check that the Person document has an Internet password set, because the Notes ID password does not work for IMAP. Make sure the UserName column in the CSV holds the Domino IMAP login and not the Microsoft 365 address, and that the password has no trailing spaces.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561333595\",\"position\":4,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561333595\",\"name\":\"Q4. How do I migrate Notes local archive files?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. Archives live on user machines, not the server, so IMAP cannot see them. Collect the archive NSF files, convert them to PST or process them with an NSF migration tool, and import them into the matching mailbox, or into the user's online archive if the mailbox is large.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561334795\",\"position\":5,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561334795\",\"name\":\"Q5. Do I need the Notes client installed to convert NSF files?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. It depends on the method. Exporting through Notes itself needs the client and a working ID. Tools that parse NSF files on their own do not need it, which makes them easier to run on a separate admin machine.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561335940\",\"position\":6,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/migrate-hcl-domino-to-microsoft-365\\\/#faq-question-1794561335940\",\"name\":\"Q6. How are encrypted Domino messages handled?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans.<\\\/strong> They stay locked unless they are decrypted with the owner's ID file. Either have users decrypt critical messages inside Notes first, or use a conversion method that accepts the ID and password during processing. 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She specializes in content optimization, website growth, and practical SEO strategies that improve visibility, engagement, and organic reach.","url":"https:\/\/www.cigatisolutions.com\/blog\/author\/khushi123\/"},{"@type":"Question","@id":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561330433","position":1,"url":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561330433","name":"Q1. Can an IMAP migration move my Domino calendars and contacts?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans<\/strong>. No. IMAP only carries mail folders and their messages. Calendars, contacts and tasks need a different route, such as exporting them from Notes, converting the NSF to PST, or using a tool that reads those items from the NSF directly.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561331820","position":2,"url":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561331820","name":"Q2. Why does the IMAP endpoint test fail when connecting to my Domino server?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans<\/strong>. The usual causes are an IMAP task that is not running, a firewall blocking port 993 or 143 from Microsoft's servers, an untrusted or expired TLS certificate, or a wrong hostname. Test the connection from outside your network first, then check the certificate chain.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561333075","position":3,"url":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561333075","name":"Q3. Users get an authentication error even though the endpoint works. What now?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans<\/strong>. Check that the Person document has an Internet password set, because the Notes ID password does not work for IMAP. Make sure the UserName column in the CSV holds the Domino IMAP login and not the Microsoft 365 address, and that the password has no trailing spaces.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561333595","position":4,"url":"https:\/\/www.cigatisolutions.com\/blog\/migrate-hcl-domino-to-microsoft-365\/#faq-question-1794561333595","name":"Q4. How do I migrate Notes local archive files?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans<\/strong>. Archives live on user machines, not the server, so IMAP cannot see them. 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