I am going to install the first Exchange 2010 CAS role on a Windows Server 2008 R2 server. At the following link I can read a comment where it is said that installation requires Net TPC Port Sharing service to be set to automatic start, and I can find the same on many other sites, but I can't find this on Technet. So, this is required or not?
While that KB article doesn't specifically mention it for R2 (only 2008 regular), this link says the setup will fail:
I am running Exchange 2010 on 2008 R2 and it has Net.TCP Port Sharing Service set to Automatic. I don't remember the install at this point though to guarantee I got the error, but I'm guessing so.