This is the one that most of us have been waiting for because the adoption of Exchange Server 2007 is rather slow. Service Pack 1 provides a lot of features that were missing from RTM and a lot of extra features as well. The most notable new features are SCR (Standby Continuous Replication) and Windows Server 2008 support. Some other cool stuff:
- Import/Export from and to PST files with PowerShell commands
- Public folder administration with the GUI
- Support for Office 2007 formats in OWA
- More OWA features like S/MIME support, public folder support and rules
- Extra ActiveSync policies for mobile devices
Go ahead and download from here.
Remember that you can deploy Exchange 2007 from scratch directly from the SP1 download because the service pack is effectively RTM+SP1 slipstreamed!



