This is a welcome addition, but the mailbox that was provisioned prematurely might now have stuff in it. it would be great if there was a way to restore the content from the smaller mailbox and merge it with the larger, with minimal code. Also, I've found that many of the times mailboxes are provisioned prematurely are related to the wrong immudableID flowing in a linked mailbox scenario. In that case, we're still required to hard-delete the cloud user.
Honestly, a better fix would be to allow us to disconnect the SPO workloads from the aAD object. We have several tools with Exchange, but those guys don't seem to acknowledge the problem.
Microsoft
