If your using MCE and the auto archive feature of the whs 2011 client installation, FYI, if you add a new Win 7 client, or need to reinstall the connector on an existing Win 7 Client, you will need to roll back the update rollup 3, otherwise you'll recieve an invalid application error when trying to access the WHS 2011 tile in MCE. MS KB below. Thanks to a post on thegreenbutton, otherwise I would have never figured out the issued, the KB never once show up in my searches so I'm posting here for anyone else that may run into this issue.
http://support.microsoft.com/kb/2758353
http://support.microsoft.com/kb/2758353