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moving mailbox's from exchange 2003 to 2007 cross connectivity?

Dear All
   i have recently set up an exchange 2007 64 bit server , after a few initial install problems it seemed to install ok and pick up the mailbox entries etc from the old server. if i move a mailbox to the new server it no longer accepts mail from the 2003 server or external mail and yet the mailbox's moved to 2007 will talk to each other.   i tried moving just a couple of box's to make sure everything worked ok (email can not go offline for more than a few minutes in our organisation) what am i doing wrong? do i need to migrate them all across and will i loose external connectivity?. the domain i have installed exchange 2007 in is part of a forest , will this effect connectivity to other donmains in the forest.
 help greatly appreciated
0
alunlewis
Asked:
alunlewis
1 Solution
 
ATIGCommented:
When you setup 2007 and new routing group connector is create between the 2003 and 2007 which handles mail flow between the 2.

Common issue that have caused problems:
Try disabling AV on the 2003
Verify your smtp virtual is not forwarding to a smart host
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