We are running in a multi-domain forest; la.contoso.com, ny.contoso.com and fl.contoso.com. Currently Exchange 2003 SP2.
If I look at ESM, I can see that under Recipient Update Services, each domain has its own RUS server and RUS DC.
One of the domains, la.contoso.com, comprises of two sites - East and West.
East will be moving to Exchange 2007, however West will remain on Exchange 2003 for the short future. At the moment, the RUS server is on eastex01.la.contoso.com - an Exchange server in East. Also, the RUS DC is eastdc01.la.contoso.com
My question is, is it correct that Exchange 2007 no longer uses RUS at all? Instead using EMail Policies? The reason I ask is apparently when Exchange 2003 is removed from a RUS server, Exchange prompts for an alternative server to hold the RUS role (which can be an Exchange 2007 server).
Secondly, if we moved the RUS service to an Exchange server in West, should we also change the RUS DC to a West DC? I assume there is a lot of traffic between the RUS Exchange server and the RUS DC?