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Migrate IMAP to Office 365 Account: 2026 Complete Guide

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  • Updated on
    May 26th, 2026
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    5 minutes
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User Query:- I have been using an IMAP email account for a while now, but my company recently decided to move everything to Office 365. I have no idea how to get all my existing emails from the IMAP account to Office 365. Can someone walk me through how to migrate IMAP emails to Office 365 in a way that actually makes sense?

Summary: Moving from an IMAP account to Office 365 sounds straightforward until you actually start moving. Figuring out the right steps without losing emails, folders, or attachments is where most people get stuck. This blog covers two ways to migrate IMAP to Office 365. The first is a manual method that works if you are comfortable with settings and configurations. The second is the IMAP Backup Tool, which makes the whole migration faster and less complicated.

Common Reasons to Transfer Emails from IMAP to Office 365

  • You will get full access to productivity tools in Office 365.
  • Limited storage in IMAP accounts becomes a problem for the growing inbox.
  • Office 365 offers better security features and standard IMAP servers.
  • Sometimes the IMAP servers can go down or get discontinued.
  • Office 365 makes it easier to manage multiple users and mailboxes.
  • Files stored inside Office 365 make the remote work smoother.

Manual Method to Migrate IMAP to Office 365

Microsoft provides a manual method to migrate IMAP mailboxes to Office 365 through the Exchange Admin Center. You may find these methods complicated, but being honest, this method works well for a small mailbox.

Steps to Import IMAP Emails to Office 365 Manually:

  1. Sign in to the Microsoft 365 Admin Center using an admin account.
  2. Open the Exchange Admin Center.
  3. Go to Recipients -> Migration -> Add Migration Batch -> IMAP Migration.
  4. Thereafter, create a CSV file that includes user email addresses, usernames, passwords, IMAP server name, and port number.
  5. Upload the CSV file to Office 365 and then verify the IMAP server connection details.
  6. Map the target Office 365 mailboxes for migration.
  7. Start the migration batch and wait until the status shows Synced.
  8. Once the process is completed, assign Microsoft 365 licenses and update DNS settings if needed.

Limitations with Manual Methods

  • Large mailbox migrations may take a very long time to complete.
  • A stable internet connection is required throughout the migration process.
  • The process can be interrupted by incorrect IMAP servers.
  • You may see duplicate or missing emails after the process.
  • You can track the status of multiple mailboxes.
  • The authentication or login issues are very common during the process.
  • The manual method is not the recommended method for bulk migration.
  • Any interruption during the migration can delay or stop the process.

Automated Tool to Migrate IMAP to Office 365 Securely

The MCD IMAP Backup Tool is a smart way to migrate your emails from an IMAP server to Office 365. It will work for both small and large files, even in bulk. You can use this tool to save your file in multiple file formats. It keeps the formatting of files and the hierarchy of folder structure the same. This tool makes sure that your data files will remain safe and intact during the migration process.

Steps to Migrate from IMAP to Office 365

  1. To begin with, download the IMAP Backup Tool.
    2. download the IMAP Backup Tool
  2. After that, log in with the IMAP credentials.
    3. log in with the IMAP
  3. Then, select the files from the folder tree and click Next.
    4. select the files from the folder
  4. Thereafter, choose Office 365 as the destination, then select the authentication method and click Next.
    5. choose Office 365 as the destination
  5. Now log in with the credentials of Office 365 and select the user ID.
    6. log in with the credentials of Office 365
  6. Further, choose the mailbox and confirm the source and destination users.
    7. confirm the source and destination
  7. At last, apply the filter and click the Start process to start IMAP to Office 365 migration.
    8. apply the filter and click to export

Related Post:Import IMAP Email to Gmail Account.

Conclusion

This is not a complicated process for the person with the right knowledge. Going through a manual process to migrate IMAP to Office 365 is not as simple as it requires prior knowledge of IMAP and Office 365. But the professional tool overcomes these limitation which occur with the manual methods. The MCD IMAP Backup Tool helps you to migrate your IMAP files within a few steps.

Frequently Asked Questions

Q1. Does IMAP migration move contacts, calendars, and tasks?

Ans. No. The native IMAP migration method only transfers emails and mailbox folders. Contacts, calendars, notes, and tasks are not included. Using the MCD IMAP Backup Tool can help simplify mailbox exports and selective migration management.

Q2. What is the maximum email size allowed during IMAP migration?

Ans. Microsoft allows emails up to 35 MB during native IMAP migration. Emails larger than the allowed size may fail or get skipped. The MCD IMAP Backup Tool helps handle large mailbox data more efficiently during migration.

Q3. Is the manual IMAP migration method suitable for large organizations?

Ans. The manual method works better for small mailbox migrations. Large organizations often prefer automated solutions like the MCD IMAP Backup Tool because manual migration becomes slow, technical, and difficult to manage at scale.

Q4. Can I migrate multiple mailboxes at once?

Ans. Yes. Microsoft allows bulk migration using a CSV file containing mailbox details. Similarly, the MCD IMAP Backup Tool supports bulk migration, which helps organizations transfer multiple IMAP accounts to Office 365 in one process.

Q5. How long does the IMAP to Office 365 migration take?

Ans: The time required to migrate IMAP emails to Office 365 depends on several factors, including mailbox size, internet speed, the number of user accounts, IMAP server performance, and attachment sizes. Small mailbox migrations may finish within a few hours, while large mailbox migrations can take several hours or even days to complete.

Q6. What are the most common issues during IMAP to Office 365 migration?

Ans: During IMAP to Office 365 migration, users commonly face issues such as login failures, connection timeouts, duplicate emails, missing folders, skipped large emails, slow synchronization, and incorrect IMAP endpoint settings. These problems usually occur because of unstable internet connections, incorrect server configurations, or authentication restrictions.

About The Author

Rohit Singh is an Email Backup, Recovery, and Migration Expert with over 6 years of experience in the software industry. He specializes in data migration solutions for Microsoft Outlook, Office 365, Google Workspace, and other popular email clients. Rohit regularly shares practical insights and technical guides to help users simplify complex email management tasks.

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