Hi We are running a mixed Exchange 2003/2007 environment (both SP2). We have mailboxes on both platforms. The Exchange 2003 RUS server is due to be decommed. I believe before we can uninstall Exchange from it, we need to move the RUS role to another server? But we can't move it to a 2007 box can we, because 2007 doesn't use RUS? So how do we get rid of it?

Are you removing 2003 completely from your environment? If so, follow this article: http://technet.microsoft.com/en-us/library/bb288905(EXCHG.80).aspxTim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Lync 2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington

You could delete the Recipient Update Service (domain) by follow this setups: 1.In Exchange 2003 or Exchange 2000 System Manager, expand Recipients, and then select Recipient Update Services. 2.Right-click each domain Recipient Update Service, and then select Delete. 3.Click Yes. And delete the Recipient Update Service (Enterprise Configuration) by using ADSI Edit (AdsiEdit.msc): 1.Open ADSI Edit, expand Configuration, expand CN=Configuration,CN=<domain>, expand CN=Services, expand CN=Microsoft Exchange, expand CN=<Exchange organization name>, expand CN=Address Lists Container, and then select CN=Recipient Update Services. 2.In the result pane, right-click Recipient Update Service (Enterprise Configuration), click Delete, and then click Yes to confirm the deletion. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.