Who wouldn’t just love to visit software giant Microsoft’s headquarters? What if you could get a chance to tour Microsoft’s headquarters at One Microsoft Way, Redmond for free? Yes, you can. Microsoft is offering a free chance to win a tour to its headquarters and a bunch of goodies via its ‘Know it. Prove it. Backstage Pass Sweepstakes‘ campaign and the total approximate value of this prize is around $4000. Sounds interesting? Keep reading to learn more about the contest.