I am attempting to install a second Exchange 2007 mailbox server into an existing environment. During setup's pre-check, I receive the following message and setup will not let me continue with the installation:
Warning: Cannot find the Recipient Update Service responsible for domain 'DC=domain,DC=local'. New and existing users may not be properly Exchange-enabled.
Elapsed Time: 00:00:03
The current environment has one Exchange 2007 server running Mailbox, HT, and CAS roles. Exchange 2003 was never part of this environment.
There is, however, a Cisco Unity server in the environment. Active Directory sees this server as part of the Exchange organization. I can't view this server object in the Exchange Console, but after pulling it up in ADSIEdit, I found that the "serialNumber" attribute for it showed "Version 6.5 (Build 6944.4)". So, I edited this value, making it "Version 6.5 (Build 7638.2: Service Pack 2)", hoping that I could fool the pre-check. :-)
In viewing the XML data file for the pre-check, it appears that this trick worked. However, I'm still having the issue. Apparently, the pre-check, in seeing that an Exchange 2003 server exists, believes that a Recipient Update Service for the domain should also exist. Obviously, since the Unity server isn't an actual Exchange server, and this is otherwise a purely Exchange 2007 organization, there is no such thing as a RUS.
So, what to do? Is there any way to skip the pre-check during setup? Is there another workaround that anyone knows of? I'm hoping someone's experienced this issue before.
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