How to Migrate AWS WorkMail to Office 365: Complete Guide

Written By Khushboo Maurya
Updated on September 18th, 2026

ⓘ Fact-checked and reviewed in accordance with our Editorial Policy

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Amazon WorkMail is a service that helps businesses manage their email, calendars, contacts, & other group work tools. Microsoft 365 offers Exchange Online along with programs like Outlook, Teams, SharePoint, Word, and Excel. Since both of these systems handle business email, companies might decide to migrate AWS WorkMail to Office 365 when they want to move their email system to Microsoft’s cloud.

Amazon WorkMail works with IMAP, which means that email data can be moved to Microsoft 365 via the IMAP process from Microsoft. However, the normal IMAP migration is mainly for email and mail folders. It does not bring over contacts, calendars or tasks. Companies that need ways to move their data might look into professional software based on what they need to move.

Table of Contents

Is it Possible to Migrate from Amazon WorkMail to Office 365?

Yes, people can easily transfer their Amazon WorkMail to Microsoft 365. Amazon WorkMail has IMAP support, so administrators can move emails and mail folders to Microsoft 365 using the IMAP method from Microsoft. However, this method does not move contacts, calendars, or tasks. For companies that need options like filters or detailed reports, a third-party migration tool can be helpful. The right way to do it depends on the type & amount of data from Amazon WorkMail that needs to be moved.

What Data Can Be Moved?

Emails: Email messages migrate Amazon WorkMail to Office 365.
Mail Folders: Transfer the Inbox, Sent Items, Drafts, & other custom folders.
Attachments: Attachments that go with the emails can be moved along with the messages.
Contacts: These are not moved through the IMAP process that Microsoft offers.
Calendars: These are not moved through the IMAP process that Microsoft offers.
Tasks: These are not moved through the IMAP process that Microsoft offers.
Folder Structure: The folders that can be moved can be set up again in the Microsoft 365 mailbox.

Manual Way to Migrate AWS WorkMail to Office 365 (IMAP)

You can use the IMAP process that Microsoft provides and the IMAP process will move the email data, from Amazon WorkMail to Microsoft 365.

Make sure the target mailboxes in Microsoft 365 are created & verified before you start the move.
Get the IMAP endpoint for Amazon WorkMail & make sure that IMAP access is available.
Verify the Microsoft 365 mailboxes to make sure that the messages & folders made it correctly.
Configure the IMAP migration setup in the Microsoft 365 Exchange admin center. Upload the required mailbox details.
Create and run the migration group to move the supported email data and folders.
After successful migration, update the MX records for your domain to send emails through Microsoft 365.

Limitations of the IMAP Process

Email and Folders: The IMAP process is mainly for moving email messages and mail folders.
Limit per Mailbox: Microsoft says that a maximum of 500,000 items can be moved per mailbox.
No Contacts, Calendars or Tasks: These items are not moved using the IMAP process from Microsoft.
Limit per Message: Messages that’re bigger than 35 MB are not moved via the native IMAP process.

Professional Way to Migrate AWS WorkMail to Office 365

When the manual method does not work to move your AWS WorkMail data to Office 365. Then, with software like Cigati Amazon WorkMail Backup Tool, you can move the data easily. This tool is a solution for all Amazon WorkMail data. It can move Amazon WorkMail emails to Microsoft 365 in a few steps and without any trouble. It helps you store a copy of your data where you want it. Let’s look at how the Amazon WorkMail to Office 365 migration works.

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This software’s simple interface helps users to migrate data easily.
Date range filter options for selective data migration.
Users can remove duplicates on the basis of To, From, Subject, and BCC.
Choose their preferred location to save files in the destination.
Skip previously migrated data, so only new and modified data is moved.
You can migrate from AWS WorkMail to Microsoft Office 365 with ease.

This way, you can migrate Amazon WorkMail emails to Office 365. In fact, users can do the move without any problems. Along with that, users can migrate AWS WorkMail to Gmail.

Pre-Migration Checklist

Make sure all the Amazon WorkMail mailboxes are active & can be reached through IMAP.
Create & confirm the Microsoft 365 user mailboxes that are needed.
Get the IMAP server address, port details, and login information for the source mailboxes.
Look at mailbox sizes. Find any big or unsupported messages before moving.
Choose which mailboxes, folders & data you want to move.
It is important to keep a backup of the WorkMail data before you start.

Post-Migration Check: Migrate Emails from AWS WorkMail to Microsoft 365

Make sure that the Microsoft 365 mailboxes have the emails & folders.
Open some messages and make sure the sender, recipient, date, formatting & attachments are correct.
Make sure the important folders are in the mailboxes.
Send and receive some test emails through Microsoft 365.
Look the reports to see the status & find any skipped items.

Conclusion

In this article, we explained how to migrate AWS WorkMail to Office 365 with a recommended solution. It is easy to use. Can finish the move in just a few minutes. Also, you can choose ways to save your Amazon WorkMail emails into different file formats. This helps you save your Amazon WorkMail emails on your computer.

Frequently Asked Questions

Q1. Which Amazon WorkMail data can be moved to Microsoft 365?

Ans. The IMAP process can move email messages and mail folders, including folders like the Inbox and the Sent Items. It does not move contacts, calendars, or tasks. (Microsoft Learn)

Q2. What should I do if there are emails during the move from Amazon WorkMail to Microsoft 365?

Ans. After the move check the results and the mailboxes. The IMAP process manages the move. The company should check the folders and messages and look into any unexpected duplicates instead of assuming that all duplicates will be removed automatically.

Q3. Can I do a move from Amazon WorkMail to Microsoft 365?

Ans. Yes. Microsoft 365 does synchronization for IMAP batches and this happens once every 24 hours. This allows emails from the source to be synchronized before the move is stopped.

Q4. How can I make sure there is not much downtime when moving from Amazon WorkMail to Microsoft 365?

Ans. Create and check the Microsoft 365 mailboxes first run the initial move and let the synchronization continue before changing the MX record. After you know the emails are working through Microsoft 365 stop the synchronization.

Q5. What happens if there are messages that have content during the move?

Ans. Messages that can’t be processed due, to not compatible or unsupported content may be marked as errors. Skipped. Look at the reports after you finish the move and check any items before you finish. Microsoft suggests using the reports to find errors in the mailboxes.

About The Author:

Khushboo Maurya

Khushboo Maurya is a digital content and SEO professional focused on creating useful, search-friendly content that connects with the right audience. She specializes in content optimization, website growth, and practical SEO strategies that improve visibility, engagement, and organic reach.