The figure comes just as Microsoft prepares to release the final version of its Windows 8 operating system, expected to hit in October.
If the shipment number is correct, "it makes Windows the most popular single system," says CEO Steve Ballmer.
Windows 8 will be the company's first true try at the current media tablet market, and will work on ARM-based devices. With its new "Metro" interface, designed for touch devices, the company hopes to take share away from market leader Apple.
Thanks to Windows 8, research firm IDC believes global PC shipments will break out of their current "funk" and grow 5 percent in 2012 compared to just 1.8 percent last year.
Written by: Andre Yoskowitz @ 21 May 2012 23:49