Hello Izuchukwu Okafor,
Hope you are doing well. Thank you for reaching out to the Microsoft community.
I read your thread and seems you want information about IMAP migration, so consider this, here sharing documentation that you can follow to do your migration. Kindly check this documentation What you need to know about migrating your IMAP mailboxes to Microsoft 365 or Office 365 | Microsoft Learn and Migrate other types of IMAP mailboxes to Microsoft 365 or Office 365 | Microsoft Learn.
On the other hand, it is recommended to consult with Microsoft support for detailed instructions tailored to your specific migration scenario. we do have a professional team for this support, so in order to better assist, please raise a service ticket in the Microsoft 365 admin center to support > service requests through navigation, as they have more access permissions than on this forum, and professional engineers will further help you.
If any information is required, kindly let us know. Thank you in advance for your understanding. Your patience and cooperation will be greatly appreciated. I hope for all the best!
Sincerely
Nafis Iqbal Shuvo
Community Moderator