If you want to migrate from Office 365 to an IMAP-based email system, the process generally requires accessing your Microsoft 365 mailbox and transferring the mailbox contents to another email account that supports IMAP protocols. The mailbox may contain emails, attachments, folders, contacts, calendars, and other important information that needs to be preserved during migration.

A practical way to perform this migration is by using SysInfo Office 365 Backup & Restore Software. The software is designed to connect directly to Office 365 and supports migration to IMAP-enabled email services. After signing in with your Office 365 credentials, you can select the mailbox folders you want to transfer. Next, choose IMAP as the destination option and provide the login details of the target email account.
Read more: https://www.sysinfotools.com/office365-backup.php