As Microsoft prepares to unveil a Windows 8.1 update that will reportedly make mouse users happier, the next version of Windows could spell doom for the desktop altogether. This particular version of Windows 9 wont be the only flavor of the OS, according to ZDNets Mary Jo Foley, but its clear that Microsoft wants to move away from legacy desktop apps. In fact, Microsoft is also expected to unveil a touch-friendly version of Office at Build, which makes sense in light of the recent debut ofOffice for iPad.