Bittitan MigrationWiz – Users getting undergoing maintenance message

One of the great, albeit risky feature in Bittitan MigrationWiz, is an ability to ask users for their password on source Office 365 tenant to make migration of their mailbox, archive or OneDrive. While this is not something you should be doing on your everyday migration, it's handy in case you are working without access to source tenant, and there's just no other way. It's either this or you tell your Client it can't be done. When you start using this feature you merely define source email address, target email address and Bittitan takes care of the rest. It sends an email for the user, user types in his credentials on Bittitan website and then those credentials are used for migration. I can hear you saying it's a terrible idea, but an alternative to this is giving Global Admin to whole Office 365 tenant, so you already hand over keys to BitTitan to all your data anyways. You either trust them, or you don't. And to be completely honest there will always be some trade-off with such services.