This morning, we released a Beta of Service Pack 1 for Exchange 2010 to the Microsoft Download Center. You can download the beta from http://go.microsoft.com/fwlink/?linkid=193120.
Exchange Server 2010 SP1 Beta includes archiving and discovery enhancements, a faster Outlook Web App, upgraded mobility features, and several additions to the Exchange Management Console.
So what are you waiting for? Go get the Beta! And remember, the Beta is for labs, development, testing, and other non-production environments. Please don't install the Beta in production.