http://blogs.technet.com/gbordier/archive/2009/03/30/publisherevidence-strikes-again-create-config-files-everywhere.aspxMy previous post about Exchange 2007 SP1 RU5 at () explained why Exchange Services where so slow to start after RU5 was applied : .Net code checks for the Microsoft Certificate Revocation List at each startup. As explained in http://support.microsoft.com/?kbid=944752en-USCommunityServer 2.1 SP1 (Build: 61025.2)