• Windows 7 Starter and Home Basic will not come with AAC, H.264 or MPEG-2 support. Microsoft seems to have the intention to provide upgrades for those systems to add the support.
• 4 Gigabytes of ram are supported by all Windows 7 editions in 32-bit mode. The differences are in 64-bit mode. Home Basic and Starter support a maximum of 8 Gigabytes, Home Premium 16 Gigabytes and Professional, Ultimate and Enterprise up to 192 Gigabytes of ram.
• WindomediaPlayer Remote Media Experience (RME) is not available in Windows 7 Home Basic or Starter. However, all versions can share media over a home network.
• All Windows 7 SKUs support 20 simultaneous SMB connections. This works out to 10 users, apparently.
• Only windows 7 Professional, Ultimate and Enterprise support the virtual XP Mode.