Only question I can think of is: what took them so long? As with Bing, the Redmond company's long awaited response to Google's dominant search platform, it seems Microsoft is late to the party. Still, it's not clear that Google's early mover status in the nascent Smart Grid market buys it all that much.
Here's Microsoft's smart grid approach described by PCWorld. I wonder how the "blue screen of death" translates in the energy world? Or if we'll be ctl-alt-deleting our homes a few times per week?