I was thinking the sticky point with compatibility might be the older drivers for the peripherals, such as the Fujitsu Snap Scan driver, the Brother MFC driver, or other items. So all of you running 64 bit are not running into these problems? Any issue predicted with running a 64 bit 'server' copy of Windows 7 Pro with other machines all using 32 bit? Or will I need to upgrade them all to 64?