Came across this tool and I like it for two reasons:
1. Export and Import to PST doesn’t exist in Exchange Online, so it isn’t as easy to Import PST files to Exchange Online Mailboxes as we are used to in Exchange OnPrem. Handy in alot of situations.
2. For smaller customers it can be a solution to simply collect everyones PST files after changing the MX Record, and upload the data to their Exchange Online Mailboxes.