You don't need us to tell you what you already know in your gut to be true: Redmond is working hard on its tablet strategy. How embarrassing is it for Microsoft, the company that pioneered tablets and the 7-inch UMPC, to be completely absent from the conversation in 2010 and 2011? That could change in September. Microsoft watcher Mary Jo Foley recently shared the slide above which she believes to be 99.99 percent genuine. The timeline shows the major milestone dates for a Windows 8 (aka, "Windows Next") release -- an OS that M. JoFo believes to be focused on tablets (aka, "Lap PCs" in Microsoft parlance) with its purpose-built touch-centr