Microsoft’s $15 million investment in Foursquare will soon result in product changes in the coming months. Bloomberg News reports that the deal will be used for location data and services that are part of Microsoft’s upcoming Windows Phone 8.1 update. The software maker is currently beta testing a “Cortana” personal assistant in Windows Phone 8.1, named after the same character found in Halo. Foursquare’s data will help Cortana push out tips, discounts, and suggestions based on location. While Microsoft isn’t commenting on Windows Phone 8.1 or Cortana, Microsoft’s Zig Serafin has revealed to Bloomberg News that Foursquare’s data will be used in future Windows Phone software.