When importing user mailboxes from Exchange server, you receive the following error message:
Failed to import mailbox: Unable to import mailbox. Mailbox is not accessible. Check if mailbox DB is accessible.
The service account used to impersonate and archive users has not enough permissions.
The service account needs to be member of "Exchange Organization Administrator" group.
NOTE: Please do this only if you already set all default permissions following official MAM guideline.
