Installing Microsoft Exchange 2007 SP2 on Windows Small Business Server 2008 currently causes problems. A prerequisite check’s deployed in Microsoft Exchange 2007 SP2 setup program for Windows SBS 2008 so that Windows SBS users’ll be alerted and prompted before proceeding with installation. SBS team is working on a tool to automate the Exchange 2007 SP2 installation; when released, users can download the tool to the Exchange 2007 SP2 setup folder and launch the SP2 setup from the tool. The tool’ll remove the prompt, stop the FSE services, launch Exchange 2007 setup UI, and then perform post-setup cleanup after SP2 installation is successfully completed. For users who want to deploy Exchange 2007 SP2 on their Windows SBS machines urgently, manual steps are provided in KB 973862.