Microsoft's launch of the Xbox One has had a rocky start -- DRM 180 anyone? -- and now Chief Product Officer Marc Whitten is leaving the company. Whitten will become the Chief Product Officer at wireless speaker company Sonos, continuing an executive reshuffling that started with former Microsoft CEO Steve Ballmer and also saw former Xbox leader Don Mattrick leave last July. In a note to the fans, he reflected on fourteen years as part of the Xbox team, proclaiming "utmost confidence" in the group and its products -- similar to what he told us at CES in January. Microsoft says the rest of the executive team (including Yusuf Mehdi and former Sony exec Phil Harrison) will remain intact and, for now, report to software platform EVP Terry Myerson, who oversees Windows Phone, Windows and Xbox.