When starting an Exchange/Microsoft 365 migration or testing your settings a user may fail with the error
The SMTP address has no mailbox associated to it
The tool is unable to locate the specified SMTP address' mailbox.
There are multiple things to check when receiving this error:
- The wrong SMTP address has been specified as the Export/Import Name or Test User Name field. Check that the user is part of the same domain specified. If the user's primary SMTP address doesn't contain this domain name, then you will need to specify their entire SMTP address, in order to point the tool at the correct location.
- The specified user hasn't been assigned a full license or doesn't have an active mailbox.