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Exchange 2010 to Exchange 2013 Cross Forest Migration

We are looking to move the mailboxes from an on-premise Exchange 2010 server hosted at a child company to our Exchange 2013 server using a cross forest migration.

I have setup a two way forest trust and have successfully migrated a couple test mailboxes however I'm encountering a problem.

When I move user1@domain.com to the new exchange server, user1 is not able to email anybody who's mailbox is still waiting to be transferred and visa-versa. In other words, user1@domain.com (now hosted on Exchange 2013) cannot send an email to user2@domain.com (who's mailbox is still waiting to be transferred).

The goal in the near future is to decommission the Exchange 2010 server altogether however for a period, both servers will need to coexist while the mailboxes are being moved.

Is there a way for Exchange 2010 to redirect email that has been sent to a mailbox now hosted on Exchange 2013?
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Adeste
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Adeste
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1 Solution
 
David CarrCommented:
Using the EAC from a 2013 Server Add the 2013 CAS or Multi-role server to the Exchange Send Connector(s). Remove the 2010 CAS or Multi-role Server(s) and  Save.
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AdesteAuthor Commented:
Thanks for your reply. I've tried to decipher what your suggesting without success.

From what I understand, I need to open the EAC on the 2013 Server and remove the Exchange 2010 server from the send connectors? Is what you mean?

There is only 1 send connector configured currently and that is setup so the Exchange 2013 server will route email directly to the MX record.

I've figured out one issue. I need to use the "prepare-moverequest" script on all mailboxes before User1 is able to email to send messages to users hosted on Exchange 2010.

The only issue left is that users on Exchange 2010 cannot send email to users who have already been moved to Exchange 2013.
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David CarrCommented:
Sorry if I was not clear. you should only remove the 2010 Server after you have added the 2013 Server. The goal is to have all mail routed using the 2013 Connector. It will get the mail to the older mailboxes.

Do you see the mail from the 2010 users queuing anywhere?
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