RDP 8.0 on Windows 7 SP1:

Installing      http://support.microsoft.com/kb/2574819 and http://support.microsoft.com/kb/2592687  on a Windows 7 and then 
attempting to RWA to a SBS 2011 standard/essentials or Essentials 2012 
server fails.

I am not seeing this on SBS 2008.

Hang loose while this is investigated, don't roll these out to 
workstations if those workstations use Remote Web Access to connect.
RDP 8.0 on Windows 7 SP1:http://social.technet.microsoft.com/Forums/en-US/winserveressentials/thread/c5ccd4a1-4502-4662-8c08-3e07c8b7eb51