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: Summary: 2 item(s). 1 succeeded, 1 failed. Elapsed time: 00:00:07 Organization PrerequisitesFailed Error:One or more servers in the existing organization is running Exchange Server 2003 without Service Pack 2 (or later). Installation cannot proceed until existing Exchange Server 2003 computers are upgraded to Service Pack 2.Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.3&id=976e716a-b14a-4e67-a913-7b2fe0e9045c 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. Thanks in advance for any advice.

Don't mean to be unhelpful, but it sounds like you need to ask Cisco if this appliance is supported with Exchange 2007, and if so, how.