Microsoft has released Microsoft Exchange Server 2007 Service Pack 1 (SP1) SDK August 2008
>> Exchange Server 2007 SP1 SDK August 2008
This release of the Exchange 2007 SP1 Software Development Kit (SDK) Documentation and Samples provides new and updated documentation and samples for building applications that use Exchange 2007 SP1. Use this SDK to help you develop collaborative enterprise applications for Exchange 2007 SP1.
>> Exchange Server 2007 SP1 SDK August 2008