Microsoft CEO Steve Ballmer visited Silicon Valley on Thursday for his annual meeting with top venture capitalists to talk about Microsoft product strategy. This was his first visit to Silicon Valley since announcing the search partnership with Yahoo in July.I had a chance to sit down with him just after that event for a hour-long one-one-one interview. In the first 10+ minutes of the interview Ballmer gives his high level thoughts on major Microsoft products and strategies (including Windows, Windows Mobile, Internet Explorer, Bing, Azure, Mesh, Natal and others), competition, the future of search and search marketing, Microsoft's "three screens and the cloud" strategy, the recent acquisition of Interactive Supercomputing and, yes, even his thoughts on Twitter.The full video and transcript are below:TechCrunch50 Conference 2009: September 14-15, 2009, San Francisco