Cmputerworld reports that Boot Camp, the Mac OS X utility that lets Mac owners run Windows in a separate partition, now requires Microsoft's newest operating system, Windows 7.

All new installations of Mac OS X 10.7, aka Lion, are equipped with Boot Camp 4, which runs only Windows 7. The older Vista and even-creakier Windows XP do not work in Boot Camp 4.

According to Apple, Boot Camp 4 requires: "An authentic, single, full-installation, 32-bit or 64-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc."

  OS X Lion requires Windows 7 for Boot Camp