Microsoft will release its latest operating system, Windows 7, to retail on October 22, 2009. The retail launch will be accompanied by customary pomp and pageantry. Microsoft CEO Steve Ballmer is his company’s pick for headlining the Windows 7 launch event to be held in New York , according to invitations Microsoft sent to journalists today. Ballmer has some relevant experience having kicked off the Windows Vista launch in NYC on Jan 30, 2007. The venue of the event is yet to be revealed.