One of the worst kept secrets rattling around Microsoft's campus is Windows Blue, the forthcoming update to Windows 8 that addresses users' bugbears about the revamped OS. However, like Picasso before it, Microsoft has decided to end its Blue Period by renaming the software with the more staid "Windows 8.1." Tami Reller, the CMO and CFO ot Microsoft's Windows Division made the big reveal during JP Morgan's Technology, Media & Telecom Conference. The upgrade will be