The Microsoft Worldwide Partner Conference (WPC) is taking place this week (July 10 – 14) in Los Angeles, with some 15,000 from around the globe in attendance at the Staples Center. It’s a huge event, with over 100 breakout sessions each day, 22 regional keynotes and country breakouts. To kick-off the show, CEO Steve Ballmer said that, thanks to partners, Windows 7 has sold more than 400 million licenses in less than two years, and is still the fastest-selling operating system in history.

Here are some  other interesting tidbits from the conference: