Im not convinced by it. In their official blog they said that the colored squares are meant to represent the company's diverse portfolio of products (Windows - Blue, Office - Red, xBox - Green, Yellow - Bing...?) but as it stands, with their choice of colors and the way the squares are aligned, it looks way too similar to the previous Windows logo. In that sense the current logo actually goes against the idea of showcasing the various products the company offers and instead reinforces a single product: Windows.
This is so common a logo it is bad. The company I worked for previously used this logo just different colour break. I know of at least a dozen companies that use this logo, just different colour variations, and have been in business a lot longer than MS. For such a large corporation to continue to copy is such a shame when the have almost unlimited resources.