I'm planning to upgrade from Exchange 2003 to Exchange 2010 over the next few months, but I've got a query in regard to Active Sync.
I understand that if you co-exist Exchange 2003 and 2010 that 2003 will still act as the bridgehead server.
What I want to know is - at what point does Active Sync "take over" on the 2010 box? Is it when the user's mailbox is transferred? or is it from day 1?
Any advice gratefully received.