It's happened. Former Microsoft exec and current Nokia CEO Stephen Elop has married his future and his past in the holy matrimony of a "strategic alliance." Windows Phone 7 is becoming Nokia's "principal smartphone strategy," but there's a lot more to this hookup -- scope out the official press release just after the break. Microsoft's Bing and adCenter will provide search and ad services across Nokia devices, while Nokia will look to innovate "on top of the platform" with things like its traditional strength in imaging. Nokia Maps will be a core part of