If you are looking for a solution to migrate IMAP emails to Office 365 then I would recommend you to use Advik Email Migration Tool. With this software, you can transfer emails from your IMAP account to Office 365 in just a few simple clicks. You just need to enter login credentials of both email accounts to begin the migration process. It can transfer all email folders and subfolders at once. Apart from this, it also provides various advanced filter options to move selected emails based on date range, to, from, subject, etc.
Steps to Migrate IMAP to Office 365
1. Run Advik Email Migration Tool on your Mac/Windows PC.
2. Choose IMAP Server and enter your account login details to sign in.
3. Select required mailbox folders that you want to transfer.
4. Choose Office 365 as a saving option.
5. Enter Office 365 account login details and click on Backup.
The software will start migrating emails from IMAP account to Office 365 mailbox.
To Know More Visit Here: https://www.adviksoft.com/email/migration.html