Currently Being ModeratedJul 20, 2011 3:53 PM (in response to terry abel)
I was getting the error message saying, essentially, PowerPC applications were no longer supported. After a few moments of hyperventilating, I did some searching.
Go to the Microsoft site and download the new MAC RDC client here http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=18140.
I downloaded, ran the install, started up my VPN connection and launched the RDC client.
Success! Easy peasy! Was able to connect to my XP and Windows 7 desktops.
Hope this works for you as well.