I'm looking to migrate from IMAP Rackspace to Microsoft 365. At the moment, we are setup in Thunderbird but since Rackspace can only handle 25GB of emails and most of my users had to archive their emails locally through Thunderbird. Just checking tool that we can use to migrate the exported archive emails from MSF to PST file so it will be compatible with outlook once the migration is complete, or is there a better option rather than converting them.