Seems like we're living parallel lives! Exactly the same for me, just got a new Mac Pro 14" this weekend, used migration assistant to transfer everything from a well-beaten Mac Air and all essentially went well - except searching in Outlook (365). I've tried putting main ID into Spotlight Privacy and taking it out, restarting and other things that don't involve rebuilding identities, just because I'm lacking in confidence and basically scared I'll do something wrong! It seems to me though that something so common must have a simple answer, so I'm just hoping that someone might come up with it! If I do, I'll post it back.