http://blogs.msdn.com/b/emeadcrmsupport/archive/2009/12/10/internet-information-services-6-0-may-not-function-correctly-after-installing-kb973917.aspx  We received some information from our IIS colleagues that the above mentioned hotfix KB 973917 which is part of the security update for December will break your IIS 6.0 functionality. This affects web-based products such as CRM, SharePoint, …  en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)