I have never had an OOM message in FSX with Windows 7 64bit. Not in the RC1 version, nor my personal Windows 7 Professional 64bit. Not only that, I have far less problems across the board with Windows 7 64bit and so this makes it the best Windows OS that Microsoft has done to date. In my personal opinion. I have never installed any Windows 7 32bit versions for my own personal use, so I can't really say how good/bad that is. I would expect it to be good though. ;D

Mark