VS2008 Beta2 VPCs expiring prematurely - SOLUTION
Solution seamed to be obvious, but nobody could tell that it is the right one before someone tired it!
I will get you to the point: you "just" upgrade Windows Server with MSDN (or other full) license. "Just" - because it takes couple of hours to do that (depending on the speed of your computer/disks).
More on this: http://blogs.msdn.com/jeffbe/archive/2007/10/27/update-on-expiring-vs2008-beta2-vpcs.aspx