Windows 7 officially will be released to the public on Thursday, and judging by our poll, most readers have already decided to upgrade. For those who haven't, or for those who want a bit more information on just what you're getting with your Windows 7 Starter, Home Premium, Professional, or Ultimate, take a look at the chart and explanation below. . Starter Home Premium Professional Ultimate . 32-bit and 64-bit versions 32-bit only Both Both Both . Maximum physical memory (64-bit mode) N/A 16 GB 192 GB 192 GB . Maximum physical CPUs supported 1 1 2 2 . Home Group (create and join) Join only Yes Yes Yes . Backup and Restore Center Cannot back up to network Cannot back up to network Yes Yes . Multiple monitors No Yes Yes Yes . Fast user switching No Yes Yes Yes . Desktop Wallpaper Changeable No Yes Yes Yes . Desktop Window Manager No Yes Yes Yes . Windows Mobility Center No Yes Yes Yes . Windows Aero No Yes Yes Yes . Multitouch No Yes Yes Yes . Premium Games Included No Yes Yes