Four months ago, Windows 7 passed Windows Vista on Steam, the leader of the digital game distribution market, and we predicted that XP was in its crosshairs. Last month, Windows 7 passed Windows XP, making it the most popular operating system on Steam. Windows 7 is also the first version of Windows where gamers are adopting 64-bit faster than 32-bit. That said, there are still more 32-bit XP users than those on Windows 7 64-bit.

Despite Windows 7's success, Windows share overall plummeted 8.43 percent from April 2010 due to all of the Mac OS users trying out Steam. XP dipped 4.81 percent, Vista use dropped 2.07 percent, and Windows 7 was down 1.55 percent.

Of the new Mac OS X users, 1.4 percent were on Leopard and 7.06 percent are using Snow Leopard. We'll see over the next few months how many of these users stick around and how many convince their Mac friends to join in on the fun.

Each month, Steam collects and compiles data about the hardware and software its customers are using so that game developers can ensure they are making good decisions about what technology should take priority in their support plans. If you're wondering, Intel is still beating AMD (72.54 percent to 27.46 percent) and NVIDIA is still beating ATI. To check out more details and the rest of the primarily hardware-based statistics, check out the link below.