http://v900u039rux.maximumasp.com/Web/blogs/hb0/archive/2007/10/20/running-multiple-versions-of-the-framework-in-asp-net.aspxLike any good technology, ASP.NET continues to evolve as new versions are released. But, like anything else, this brings with it a number of considerations. Microsoft has done a great job of allowing multiple versions of the framework to run side by sideenCommunityServer 2007 SP2 (Build: 20611.960)