{"id":11771,"date":"2026-08-22T12:35:11","date_gmt":"2026-08-22T12:35:11","guid":{"rendered":"https:\/\/www.cigatisolutions.com\/blog\/?p=11771"},"modified":"2026-08-24T10:57:22","modified_gmt":"2026-08-24T10:57:22","slug":"outlook-mailbox-size-not-reducing-after-archive","status":"publish","type":"post","link":"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/","title":{"rendered":"You Archived Your Emails. Your Mailbox Is Still Full. Here&#8217;s Why."},"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;11771&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;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&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;5\\\/5 - (1 vote)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;You Archived Your Emails. Your Mailbox Is Still Full. Here\\u0026#039;s Why.&quot;,&quot;width&quot;:&quot;142.5&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: 142.5px;\">\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            5\/5 - (1 vote)    <\/div>\n    <\/div>\n<div class=\"case-study-n my-3\">\n<p><span style=\"font-weight: 400;\">You ran the archive. Waited. Checked the size. Nothing changed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This can happen because Outlook archive not reducing mailbox size &amp; local Outlook data files differently, and it depends on how you archived the messages.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Let me walk you through what&#8217;s really going on, what fixes actually stick, &amp; when you need to stop fighting Outlook&#8217;s built-in tools &amp; use something that was built for this exact mess.<\/span><\/p>\n<\/div>\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\/outlook-mailbox-size-not-reducing-after-archive\/#What_does_Outlook_Archive_Reduce_Mailbox_Size\" >What does Outlook Archive Reduce Mailbox Size?<\/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\/outlook-mailbox-size-not-reducing-after-archive\/#The_Real_Reasons_Your_Size_Wont_Budge\" >The Real Reasons Your Size Won&#8217;t Budge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Recoverable_Items_can_also_affect_data_storage\" >Recoverable Items can also affect data storage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Your_archive_PST_is_already_hitting_walls\" >Your archive PST is already hitting walls<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#The_Manual_Fixes_And_Where_They_Break_Down_outlook_does_archiving_reduce_mailbox_size\" >The Manual Fixes (And Where They Break Down): outlook does archiving reduce mailbox size<\/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-6\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Force_a_real_compaction\" >Force a real compaction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Check_where_your_archive_actually_went\" >Check where your archive actually went<\/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-8\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#When_Manual_Methods_Hit_a_Wall\" >When Manual Methods Hit a Wall<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Cigati_PST_Splitter_The_Tool_That_Actually_Solves_This\" >Cigati PST Splitter: The Tool That Actually Solves This<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#How_This_Fits_Your_Workflow\" >How This Fits Your Workflow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#What_to_Skip_Entirely\" >What to Skip Entirely<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Quick_Decision_Guide\" >Quick Decision Guide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Conclusion\" >Conclusion<\/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-14\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_does_Outlook_Archive_Reduce_Mailbox_Size\"><\/span>What does Outlook Archive Reduce Mailbox Size?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Outlook offers different ways to archive emails. Look with AutoArchive or manual PST archiving, older emails can be moved to a separate PST file. However, when you use the <\/span><a href=\"https:\/\/support.microsoft.com\/en-us\/outlook\/mail\/archive-in-outlook-for-windows\" target=\"_blank\" rel=\"noopener\"><b>Archive option in Microsoft 365<\/b><\/a><span style=\"font-weight: 400;\"> or Exchange. The emails are moved to the Archive folder. So the size of your primary mailbox does not decrease.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A similar <\/span><a href=\"https:\/\/learn.microsoft.com\/en-us\/answers\/questions\/5633480\/outlook-mailbox-size-not-reduced-after-enabling-ar\" target=\"_blank\" rel=\"noopener\"><b>Microsoft Q&amp;A<\/b><\/a><span style=\"font-weight: 400;\"> discussion also covers cases where Outlook mailbox size does not decrease after archiving.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here&#8217;s the part that trips everyone up: moving data out doesn&#8217;t automatically shrink the container it came from.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Think of it like move your furniture out of a house. The rooms are emptier, but the house itself hasn&#8217;t changed size. Similarly, when you remove items from a PST or OST. It can leave unused space inside the data file until Outlook compacts it.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That process is called compaction. Outlook can compact PST &amp; OST files automatically during idle time when sufficient unused space is available. (<\/span><a href=\"https:\/\/support.microsoft.com\/en-us\/outlook\/reduce-the-size-of-your-mailbox-and-outlook-data-files-pst-and-ost\" target=\"_blank\" rel=\"noopener\"><b>Microsoft<\/b><\/a><span style=\"font-weight: 400;\">)<\/span><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Real_Reasons_Your_Size_Wont_Budge\"><\/span>The Real Reasons Your Size Won&#8217;t Budge<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Your OST file may still contain unused local space.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you&#8217;re using<\/span><b> Microsoft 365<\/b><span style=\"font-weight: 400;\"> or <\/span><b>Exchange with Cached Exchange Mode<\/b><span style=\"font-weight: 400;\">, Outlook maintains a local copy of your mailbox in an OST file. Changes to the mailbox do not necessarily cause the OST file to shrink immediately.\u00a0 Microsoft notes that Outlook data files may not reduce in size even after items are removed. <\/span><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recoverable_Items_can_also_affect_data_storage\"><\/span>Recoverable Items can also affect data storage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When items are deleted from Exchange mailboxes. They can remain in the hidden Recoverable Items folder depending on deletion, retention, &amp; hold settings. Recoverable Items has its own quota and can become a storage concern, particularly for mailboxes subject to retention or litigation holds. (<b><a href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/policy-and-compliance\/recoverable-items-folder\/recoverable-items-folder\" target=\"blank\">Microsoft Learn<\/a><\/b>)<\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Your_archive_PST_is_already_hitting_walls\"><\/span>Your archive PST is already hitting walls<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Modern Outlook caps PST files at 50 GB by default. Older versions capped them at 20 GB.<\/p>\n<p>You think you&#8217;re archiving. Your <b><a href=\"https:\/\/www.cigatisolutions.com\/blog\/fix-outlook-mailbox-is-full-error\/\" target=\"blank\">archive mailbox is almost full<\/a><\/b>. Nothing moves. Nothing shrinks. And you&#8217;re left wondering what went wrong.<\/p>\n<p>Compaction requires Outlook to compact during idle time.<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Manual_Fixes_And_Where_They_Break_Down_outlook_does_archiving_reduce_mailbox_size\"><\/span>The Manual Fixes (And Where They Break Down): outlook does archiving reduce mailbox size<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Let me be straight with you: these steps work for some people in some situations. But they all have failure points that nobody talks about.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Empty everything \u2014 including the hidden stuff<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Empty your Deleted Items folder in Outlook<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Log into Outlook Web Access<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Navigate to Deleted Items &gt; &#8220;Recover items deleted from this folder&#8221;<\/span><\/li>\n<\/ul>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Force_a_real_compaction\"><\/span>Force a real compaction<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><b>For OST files<\/b><span style=\"font-weight: 400;\">: close Outlook, wait 30 seconds, reopen. Background compaction runs when idle. If that doesn&#8217;t work, the nuclear option is renaming your OST file &amp; letting Outlook rebuild it from the server.<\/span><\/p>\n<p><b>For PST files<\/b><span style=\"font-weight: 400;\">: right-click the PST root, go to<\/span><b> Data File Properties<\/b><span style=\"font-weight: 400;\"> &gt; then click on <\/span><b>Advanced <\/b><span style=\"font-weight: 400;\">&gt; <\/span><b>Compact Now<\/b><span style=\"font-weight: 400;\">. This reclaims whitespace but won&#8217;t touch structural corruption. <\/span><\/p>\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Check_where_your_archive_actually_went\"><\/span>Check where your archive actually went<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">A surprisingly common mistake: archiving to a PST that&#8217;s still mounted in your Outlook profile. You archived 20 GB, but it&#8217;s still visible &amp; accessible in the same Outlook window.\u00a0<\/span><\/p>\n<p><b>Go to File &gt; Account Settings &gt; Data Files<\/b><span style=\"font-weight: 400;\">. If your archive PST appears in that list, it&#8217;s still part of your active profile. Detaching a PST file does not free up Microsoft mailbox.<\/span><\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_Manual_Methods_Hit_a_Wall\"><\/span>When Manual Methods Hit a Wall<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">I&#8217;ve been through this cycle enough times to recognize the point of no return. You compact. You purge. You rebuild. And if your PST is still 40+ GB, Outlook still crawls on startup, &amp; search takes 30 seconds to return results.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">At this stage, you&#8217;re dealing with problems such as:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The file is simply too big to manage.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Large Outlook data files<\/b><span style=\"font-weight: 400;\"> can take longer to open, search, and manage. Keeping archive data organized across appropriately sized files can make ongoing management easier.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Outlook has configurable data-file size limits<\/b><span style=\"font-weight: 400;\">. Increasing these limits should be considered carefully because very large data files can be harder to manage &amp; back up. Rather than relying solely on a larger PST, consider organizing older data into multiple archive files.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You need to <\/span><b>split the file, &amp; Outlook can&#8217;t do that<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This is where a dedicated PST splitting tool can help you to divide large files into smaller, more manageable archives.<\/span><\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cigati_PST_Splitter_The_Tool_That_Actually_Solves_This\"><\/span>Cigati PST Splitter: The Tool That Actually Solves This<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"migrate-btn-n my-4\">\n<p>I&#8217;ve looked at a lot of PST tools over the years. Most are either too limited (2 GB file caps, no folder hierarchy preservation) or too risky (cloud-based processing that uploads your corporate email to someone else&#8217;s server).<\/p>\n<p><b><a href=\"https:\/\/www.cigatisolutions.com\/split-pst-tool\/\" target=\"blank\">Cigati PST Splitter<\/a><\/b> gets the fundamentals right in ways that matter when you&#8217;re dealing with real production data.<\/p>\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-PST-Splitter_for-windows.exe\" rel=\"nofollow\"><i class=\"icon-windows\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"secondary-btn\" href=\"https:\/\/www.cigatisolutions.com\/split-pst-tool\/purchase-now.php\" target=\"blank\" rel=\"nofollow\"><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-PST-Splitter-for-mac.dmg\" rel=\"nofollow\"><i class=\"icon-apple\"><\/i> Download Now<\/a>\u00a0\u00a0<a class=\"secondary-btn\" href=\"https:\/\/www.cigatisolutions.com\/split-pst-tool-for-mac\/purchase-now.php\" target=\"blank\" rel=\"nofollow\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<table style=\"border-collapse: collapse; margin: 20px auto; text-align: left; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>It splits by what you actually care about<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Size, date, folder, or specific email ID. Need five 10 GB chunks from a 50 GB monster? Done. Want everything from 2022 in one file and 2023\u20132024 in another? Set the date range &amp; walk away. This isn&#8217;t manual dragging \u2014 it&#8217;s precise, automated segmentation that preserves your folder structure exactly as it exists.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>No Outlook required<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">You can run the split on a machine without Outlook installed. This matters more than you&#8217;d think &#8211; migration servers, technician workstations, environments where installing Outlook just to split a file is overkill. <b><a href=\"https:\/\/www.cigatisolutions.com\/blog\/split-pst-file-without-outlook\/\" target=\"blank\">Split PST File without Outlook<\/a><\/b> through Cigati Software.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>Handles the edge cases<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Password-protected PSTs? It processes them. Minor corruption? It includes repair capability. Most competitors choke on encrypted files or demand you repair first with a separate tool. Cigati handles both in one pass.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>Preserves everything that matters<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Folder hierarchy, email metadata, attachments, timestamps \u2014 all intact. When you open a split file in Outlook, it behaves exactly like the original. No flattened folders. No missing properties. No &#8220;where did my attachments go?&#8221; panic.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>Non-destructive by design<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">The original PST stays untouched. New split files are created independently. If something goes wrong during the split, your source data is safe. This sounds basic, but I&#8217;ve watched free tools modify source files in-place and leave users with corrupted data and no backup.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><iframe loading=\"lazy\" title=\"Outlook Archive Not Reducing Mailbox Size? Here&amp;apos;s Why\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/SWDIWo4a9iw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_This_Fits_Your_Workflow\"><\/span><br \/>How This Fits Your Workflow<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Archive old emails<\/b><span style=\"font-weight: 400;\"> through Outlook&#8217;s built-in archive.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When the archive PST becomes large or difficult to manage, use Cigati PST Splitter to divide it into smaller files. [Have a look at how <\/span><a href=\"https:\/\/www.cigatisolutions.com\/split-pst-tool\/how-it-works.html\" target=\"blank\"><b>Cigati PST Splitter<\/b><\/a><span style=\"font-weight: 400;\"> works to split your files.]<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Split into logical chunks \u2014 by year, by size, whatever makes sense for your access patterns<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Detach the oversized archive from Outlook.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Attach only the split file you need regular access to.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Store the rest on external drives or network storage.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Your Outlook starts faster. Search works properly. And your archive is organized into files that won&#8217;t take everything down if one corrupts.<\/span><\/p>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_to_Skip_Entirely\"><\/span>What to Skip Entirely<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Let me save you some pain:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Just delete more emails<\/b><span style=\"font-weight: 400;\">: Deleting unnecessary emails may help reduce Outlook mailbox size.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Registry hacks to increase PST limits<\/b><span style=\"font-weight: 400;\">: Avoid relying on increased PST limits as the only solution for managing large archive files.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Free online PST splitters:<\/b><span style=\"font-weight: 400;\"> file size caps, attachment stripping, and uploading sensitive email to cloud servers. Hard pass.<\/span><\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quick_Decision_Guide\"><\/span>Quick Decision Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table style=\"border-collapse: collapse; margin: 20px auto; text-align: left; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>What you&#8217;re dealing with<\/strong><\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\"><strong>What to do<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">Mailbox over limit<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Check mailbox usage, Deleted Items, Recoverable Items, &amp; retention settings.<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">OST is huge, but server mailbox looks fine<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Rename OST, let Outlook rebuild from server<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">Single PST under 10 GB, just needs tidying<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Manual folder drag (if you&#8217;re patient and lucky)<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">PST over 15 GB, needs reliable, safe splitting<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Cigati PST Splitter<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">Corrupted PST that won&#8217;t open properly<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\"><b><a href=\"https:\/\/www.cigatisolutions.com\/outlook-email-recovery\/\" target=\"blank\">Cigati PST Recovery<\/a><\/b><\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #000; padding: 10px;\">Recurring quarterly archive-and-split need<\/td>\n<td style=\"border: 1px solid #000; padding: 10px;\">Cigati PST Splitter (automated, repeatable)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Outlook provides several built-in ways to archive &amp; manage email, but large mailboxes and PST files can still require additional organization and storage management. It moves emails around. It doesn&#8217;t solve the structural problem of files that grow too large to manage.<\/p>\n<p>When an archive PST becomes large enough to make access, backup, or ongoing management difficult, split them into smaller files can provide a more manageable structure.<\/p>\n<p>Cigati PST Splitter provides a way to divide large PST files into smaller, organized files that are easier to manage. Your mailbox doesn&#8217;t have to stay bloated. And your archive doesn&#8217;t have to be a single point of failure.<\/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-1787400286115\"><strong class=\"schema-faq-question\"><strong>1. Does archiving actually make my Outlook mailbox smaller?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Not always. The built-in Archive folder in Microsoft 365 keeps emails inside your mailbox. Just in a different folder, so your total mailbox size doesn&#8217;t change. A PST-based archive works differently since it takes emails out of the mailbox entirely.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1787400330284\"><strong class=\"schema-faq-question\"><strong>2. My PST file is still huge even after I deleted emails &#8211; why?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Removing emails doesn&#8217;t automatically shrink the PST file itself. Deleted space inside the file often stays allocated until you run a compacting process, which is what actually reclaims that room.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1787400343188\"><strong class=\"schema-faq-question\"><strong>3. Why does my OST stay large even after cleaning up my mailbox?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Just like a PST, an OST can hold onto unused space internally. Outlook sometimes compacts it automatically when idle, but that doesn&#8217;t always happen right away, so the file size may not drop immediately.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1787400358148\"><strong class=\"schema-faq-question\"><strong>4. Is it possible to break a large PST into smaller ones?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Yes &#8211; a PST splitter can divide a large file based on things like file size, date range, folder structure, or other criteria, &amp; make it far easier to manage.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1787400368702\"><strong class=\"schema-faq-question\"><strong>5. If I split my PST, will that lower my Microsoft 365 mailbox quota?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. No. Splitting only reorganizes data already saved locally in the PST &#8211; it has no effect on your server-side mailbox quota in Microsoft 365.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1787400380405\"><strong class=\"schema-faq-question\"><strong>6. Is it a good idea to clear out Recoverable Items to save space?\u00a0<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans<\/strong>. Be careful here &#8211; check your retention policies and hold settings first. If your organization has litigation holds or retention rules in place. They can restrict what happens to Recoverable Items, so it&#8217;s worth confirming with your Microsoft 365 admin before you delete anything permanently.<\/p> <\/div> <\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>You ran the archive. Waited. Checked the size. Nothing changed. This can happen because Outlook archive not reducing mailbox size<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/\">Read More<\/a><\/p>\n","protected":false},"author":16,"featured_media":14093,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-11771","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook-error"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Outlook Archive Not Reducing Mailbox Size? Fix It<\/title>\n<meta name=\"description\" content=\"Learn why Outlook archive isn&#039;t reducing mailbox size and discover ways to archive emails, free up space, and manage Outlook storage.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cigatisolutions.com\/blog\/outlook-mailbox-size-not-reducing-after-archive\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Outlook Archive Not Reducing Mailbox Size? 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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\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400286115\",\"position\":1,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400286115\",\"name\":\"1. Does archiving actually make my Outlook mailbox smaller?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. Not always. The built-in Archive folder in Microsoft 365 keeps emails inside your mailbox. Just in a different folder, so your total mailbox size doesn't change. A PST-based archive works differently since it takes emails out of the mailbox entirely.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400330284\",\"position\":2,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400330284\",\"name\":\"2. My PST file is still huge even after I deleted emails - why?\u00a0\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. Removing emails doesn't automatically shrink the PST file itself. Deleted space inside the file often stays allocated until you run a compacting process, which is what actually reclaims that room.\",\"inLanguage\":\"en-US\"},\"inLanguage\":\"en-US\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400343188\",\"position\":3,\"url\":\"https:\\\/\\\/www.cigatisolutions.com\\\/blog\\\/outlook-mailbox-size-not-reducing-after-archive\\\/#faq-question-1787400343188\",\"name\":\"3. Why does my OST stay large even after cleaning up my mailbox?\u00a0\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Ans<\\\/strong>. Just like a PST, an OST can hold onto unused space internally. 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