http://blogs.technet.com/srd/archive/2008/12/30/information-regarding-md5-collisions-problem.aspxToday Microsoft released a security advisory (961509 ) regarding collisions in MD5 hashes on certificates. This specific problem affects the entire industry and is not a Microsoft specific vulnerability. Serious weaknesses in MD5 have been known for manyen-USCommunityServer 2.1 SP1 (Build: 61025.2)