I'm aghast at this. Have just been building a new Ex2007 machine and find (luckily before it goes into production) that either it wont work properly or at least wont be upgradable with the latest service pack??
I can understand different OSs having compatibility issues with old software but
a) Exchange 2007 is the current release. 2010 isnt here yet.
b) Win2008R2 sounds like an incremental upgrade to 2008. Its not called 2009.
Also, why did it not occur to someone to put a warning to anyone trying to install Ex2007Sp1 on Win2008R2? You have to make a couple of minor fudges to get it working, but we'll all done that plenty of times in the past and sort of expect it with new releases. Nowhere does it say that furture releases of Ex2007 will not work.
Very poor decision in my mind, especially as I now have to rip up the past few days work and restart.