Imagine for a second that you're Microsoft. Unimaginably rich, a bit bloated after years on the Office hog, and worried about a few big projects you've been meaning to finish if only you could find the time. So what day would you choose to launch your brick-and-mortar stores back into retail if you were Microsoft's David Porter, vice president of retail stores and former Wal-Mart exec? If it was us, we'd choose October 22nd, the official Windows 7 launch. That's exactly what a number of tipsters are telling us courtesy of an in-person briefing by Kevin Turner, Microsoft's COO. Specifically, the Scottsdale store will swing t