Microsoft invested $15 million and set up a strategic partnership with Foursquare, Chief Executive Dennis Crowley said in an with the Wall Street Journal. The company announced a $35 million investment round last December. Microsoft signed a multi-year deal to license Foursquare's data on its various products and platforms. Exactly how the data will be used is not clear. While Crowley noted that made Microsoft its largest data licensee he didn't say how much that deal was worth.