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