To end the speculation that Microsoft CEO Steve Ballmer might be a scheduled speaker at Apple’s Worldwide Developer Conference next month in San Francisco. Microsoft tweeted that a hilarious, rumor-busting Tweet, “Steve Ballmer not speaking at Apple Dev. Conf. Nor appearing on Dancing with the Stars. Nor riding in the Belmont. Just FYI.” The rumors about Ballmer’s involvement started earlier after stock analyst Trip Chowdhry noted that seven minutes of the June 7 keynote by Steve Jobs had been set aside for Microsoft to talk about Visual Studio 2010.