IMAP (Gmail account) Migration to Office 365

https://docs.microsoft.com/en-us/exchange/mailbox-migration/migrating-imap-mailboxes/prepare-gmail-or-g-suite-accounts

Steps in Google Account

1. To enable IMAP for Gmail or Google Workspace Accounts:

2. To turn on 2-step verification

3. To create an app password (it will be use for authentication in file instead of G-mail password)

Steps in Office 365 Admin Credentials

https://docs.microsoft.com/en-us/exchange/mailbox-migration/migrating-imap-mailboxes/migrate-g-suite-mailboxes

1. Go to the Classic Exchange admin center.

2. In the EAC, go to Recipients > Migration > More > Migration endpoints.

Click New to create a new migration endpoint.

4. On the Select the migration endpoint type page, choose IMAP.

5. On the IMAP migration configuration page, set IMAP server to imap.gmail.com and keep the default settings the same.

6. Click Next. The migration service uses the settings to test the connection to Gmail system. If the connection works, the Enter general information page opens.

7. On the Enter general information page, type a Migration endpoint name, for example, Test5-endpoint. Leave the other two boxes blank to use the default values.

8. Click New to create the migration endpoint.