Office 365 Migration to another tennant

Copper Contributor

We have an aquisition for another company we need to move into our tenant.  They currently have 365 as well

us- tenant 1 with email addresses

their - tenant 2 email addresses 


Can we have say 10 users at a time connect to tenant 1 but send/receive as  ie, we set the spf record and fwd their mail in tenant 2 to tenant 1.  Maybe some trickery w/ adding their as a non-internet upn, setting spfs and fwd their tenant mailboxes to our tenant.


Can't be the 1st person to do this, so looking for advice.


1 Reply

Not without using third-party tools. Here's what Microsoft is (planning to) offer, but will probably take some time: