Migration and Co-existence with Exchange UM 2007 and Exchange UM 2010

There are four main parts when planning either a migration from EUM 2007 to EUM 2010 and/or having a co-existence in place.   Associate Exchange UM 2010 with existing/legacy Exchange UM 2007 Dial Plan Associate IP Gateway to Exchange UM 2010 Upgrade Dial Plan, IP Gateway, Mailbox Policies and Auto Attendants Move custom Auto Attendant…

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When we dial the subscriber access number we get a message "Sorry the person you are trying to reach does not have a valid mailbox on our system."

I recently worked an issue where the Dialogic DMG 1008 Media Gateway would send diversion to the Exchange UM 2010 SP1 server and the net result was when we dialed the subscriber access number, we were presented with a message of, "Sorry the person you are trying to reach does not have a valid mailbox…

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