Microsoft's Corporate VP of Windows, Tammi Reller, admitted today at the Windows Partner Conference that nearly three quarters, or 74 percent, of business PCs are still using Windows XP. Despite both Windows Vista and 7 having been released as far back as three years ago, many have refused to upgrade and in some cases are keeping systems for longer than they would have before. The average age of a work PC is older than it has ever been, at 4.4 years, Reller said.
