Beware: If you are thinking about upgrading to Windows 7 SP1 and your company uses Outlook 2010 to connect to Apptix Hosted Exchange, don't. As of this date it does not work.
I've been "testing" Windows 7 SP1 since it was released last week via MSDN and ever since then Outlook 2010 has been unable to make a connection to Apptix's Exchange Server. I've sent an email to Apptix so hopefully they will find a fix. It wasn't until I removed Windows 7 SP1 that Outlook was able to reconnect and grab the last 6 days of email.
To remove Windows 7 SP1 go to Programs and Features > Click View installed updates on the left hand side > scroll down to the Microsoft Windows section and remove the update called "Service Pack". (I forget the KB#).