Hello All, I am migrating from 2010 to 2013. The Exchange Server Deployment Assistant is proving very helpful thus far. I created a mailbox in 2013 and attempted to email a 2010 user. No luck - the email gets stuck in the queue "Last Error: 400 4.4.7 Message delayed". I can see that it is attempting to send the email to the correct database in 2010 but that is the extent of my troubleshooting knowledge.
I have yet to complete the step "Enable and Configure Outlook Anywhere" which states: "To allow your Exchange 2013 Client Access server to proxy connections to your Exchange 2010 servers, you must enable and configure Outlook Anywhere on all of the Exchange 2010 servers in your organization." - I haven't yet done this because I didn't want anything destructive to happen to the current 2010 server, but perhaps to enable a 2013 user to send to a 2010 user this step needs to be completed - thoughts? Btw, 2010 can successfully email a 2013 user. Is it a particular receive connector that I need to modify?
Cheers, db.