Followed https://technet.microsoft.com/en-us/library/ee861103(v=exchg.150).aspx to move mailboxes cross-forest between 2 EX2013 servers. Pull migration.
The moves pause for several hours at 99%, and ultimately complete with CompleteWithWarning status. So far, it happens every time. Occurs even with mailboxes created and immediately moved, so it is not a problem with specific, perhaps corrupt mailboxes.
Get-MailboxStatistics -IncludeMoveReport tells me this:
Warning: Unable to update Active Directory information for the source mailbox at the end of the move. Error details: Not connected.
There's a bi-directional forest & domain trust that appears to be working, cross-forest DNS works, and it's able to "connect" to AD in the remote forest for purposes of moving the mailbox, so I'm not sure why it's finding it's "Not connected" when it cleans up at the end.
After the move request goes from 99% to 100% (after a lengthy timeout), the source mailbox still exists, and both source and destination mailboxes can be logged on to. My understanding is that the user account in the source forest should be converted to a mail-enabled user.
I'm OK with troubleshooting and solving this if it's fast. But I'm also OK with writing a PowerShell script to post-process the user account in the source forest to get over the hurdle, since this is a one-time process...the source forest will ultimately go away.
So I'm guessing the script will be as simple as--
Disable-Mailbox someuser@domain.local
Enable-MailUser someuser@domain.local
Also, I'm not clear on whether this is relevant to the MEU, but inbound SMTP will continue to go to the source mail server until migration is complete, so the source server needs to redirect mail for moved mailboxes to the destination server. Both servers have the same external domain. I'm thinking this ends up being handled by a Transport Rule I can create in the same script, so the internal, secondary SMTP address stamped on the mailbox by Email Address Policies should do the job. But if there's something I need to include in Enable-MailUser, please advise.