Microsoft must be getting pretty serious about the adoption of its upcoming Windows Phone 7 (WP7) operating system, as the software giant has promised all employees a free smartphone at its Global Exchange meeting, which would see as many as 90,000 staff members getting a WP7 device when it begins to ship sometime before the holiday. It wasn’t stated which company would be supplying the phones, but you can expect that an order of 90,000 devices would make most manufacturers happy. Such a move could also be part of an action to reduce the number of competitors’ devices at the company, as many Microsoft employees do carry iPhones, BlackBerrys, or Android-powered devices.