Migrate IMAP to Office 365 Account? Quick & Easy Methods

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Updated on
February 24, 2026

5 minutes Read

Summary:Are you one of them, thinking about moving from an IMAP email setup to Office 365? Want all your emails and data to come along safely? This blog walks through the options simply. No overcomplicated stuff. Just what actually works. We’ll talk about manual ways to migrate IMAP to Office 365, and also the MacSonik IMAP Backup Tool if you don’t want to deal with too many steps.

Real User Question

Rickleton Dark shared this:

He has a few users on a local IMAP-based email setup. Office apps are old, but Microsoft 365 Business Premium accounts are already created. He’s looking for the easiest way to move everything.

He thought about PST export/import using Outlook. IMAP migration in Office 365 is another option, but it doesn’t move contacts or calendars. He’s also open to a paid tool if it can migrate emails and maybe even desktop data.

Reasons to Migrate IMAP Mailboxes to Office 365

  • You can check emails from anywhere. Phone, laptop, browser.
  • Security is better compared to a basic IMAP setup. Updates happen regularly in the background.
  • You don’t have to think much about backups. Emails stay saved in the cloud.
  • Managing users is simpler. Admins can handle accounts and permissions from one place.
  • It’s not just email. You also get a calendar, contacts, and other tools together.
  • When the company grows, adding new users is not complicated.

Traditional Methods to Migrate IMAP to Office 365

Here are two simple manual ways that can work for small migrations. You just need some basic idea of Microsoft 365 and Microsoft Outlook before starting.

Method 1: Import IMAP to Office 365 Using M365 Admin Center

  1. First, prepare a CSV file with users’ email IDs, usernames, and passwords.
  2. Then, log in to the M365 Admin Center and verify your domain.
  3. Assign the required Microsoft 365 licenses to users.
  4. Create a migration endpoint using your IMAP server details.
  5. Go to Data Migration and create a migration batch in the Exchange Admin Center (EAC).
  6. Upload the CSV file with IMAP account details.
  7. Start the migration process and monitor the progress.
  8. Wait for the final sync, then complete the batch.
  9. After everything is done, update your domain’s MX records to Office 365.

Method 2: Migrate IMAP Email to Office 365 Use Drag & Drop

  1. Add both the IMAP and the Office 365 accounts to Outlook.
  2. Let both accounts sync completely.
  3. Select emails from the old mailbox and drag them into the Office 365 mailbox.
  4. Wait while Outlook uploads and syncs the data to Office 365.

Limitations

  • Large mailboxes can make the migration batch very slow.
  • Updating MX records incorrectly can affect mail flow.
  • It’s easy to miss folders or emails.

Professional Way to Migrate IMAP to Office 365 Account

If you don’t want to deal with the long manual setup, you can use the IMAP Backup Tool. It works with accounts like Gmail, Yahoo Mail, etc. If you have multiple accounts, there’s a CSV option where you can add account details and migrate them together. It can also be used to import IMAP email to Gmail or another IMAP account if needed. The tool runs on Windows and works across different versions without much setup.

Steps to Import IMAP email to Office 365

  1. Firstly, download the IMAP Backup Tool.
  2. Then, log in with the respective IMAP credentials.
  3. Further, select and preview your files and click Next.
  4. After that, choose Office 365 and sign in with its details.
  5. Lastly, use filters and click the Convert button.

Successful User Case

Daniel Morris was handling email for a small office that was still running on a basic IMAP setup. The company had already purchased Microsoft 365 accounts but hadn’t moved the data yet.

He first tried the manual migration method, but it required too many steps and constant checking. With multiple mailboxes to move, it quickly felt time-consuming.
To make things easier, Daniel used the IMAP Backup Tool. He added the account details through CSV, selected Office 365 as the destination, and started the process. The emails, along with attachments and folders, were transferred properly.

Conclusion

To conclude, you can migrate IMAP to Office 365 account easily through a couple of ways. You can use the manual way, or else you can use the professional IMAP Backup tool. If you have a few files to migrate, you can go with a manual. Otherwise, if you have many files, then using the professional tool is the best solution.

Frequently Asked Questions

Q1. How do I migrate IMAP emails to Office 365 with attachments?

Ans: You can use the manual migration through the Microsoft 365 Admin Center or drag and drop using Microsoft Outlook. Additionally, the IMAP Backup Tool can log in to your IMAP account and transfer everything directly to Microsoft Office 365.

Q2. Is it possible to import multiple IMAP mailboxes to Office 365?

Ans: The IMAP Backup Tool also provides a CSV option, which allows you to add multiple IMAP account details and migrate them together.

Q3. Can I remove duplicates while migrating IMAP to Office 365

Ans: The IMAP Backup Tool allows you to use the available filter options before starting the process, which helps you control what data gets migrated.

Q4. What is the best method to migrate IMAP to Office 365?

Ans: For small migrations, the manual method can work if you follow the steps carefully. For larger mailboxes or multiple users, using the IMAP Backup Tool is usually easier since it reduces manual steps and handles bulk migration more smoothly.

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