http://blogs.iis.net/wonyoo/archive/2009/03/18/microsoft-application-request-routing-arr-version-2-for-iis7-beta-1-has-been-released.aspxFollowing the ARRv1 RTW release last month, the ARR team has released ARRv2 Beta1 release today. (The "official" announcement can be found here .) ARRv2 is an incremental release that has all the features of ARRv1, but we added a support for disk cacheenCommunityServer 2007 SP1 (Build: 20510.895)