"It has become clear to me the organization is moving in a direction that does not fit either my expertise or my skill sets," reads Westlake's statement to Variety.
"Over the last few months Microsoft has been undergoing a large-scale reorganization. During that period, I have had the privilege of working with numerous talented and professional people. While I will miss their company and our interaction, I truly believe that this move is in the best interest of all parties concerned. I want to thank my talented and committed team, as well as Yusuf Mehdi, Robbie Bach, Will Poole and Hank Vigil, all of whom had a significant and positive impact on me during my tenure at Microsoft."
Westlake joined Microsoft in August 2004 after a long career in Hollywood, having consulted for Comcast and NBC Universal, and chaired Universal Studios' Television & Networks group. At Microsoft, Westlake liaised with TV, film, and music industries, and helped push Xbox towards becoming an all-in-one games and entertainment hub.
That push continues in 2014 with original programming coming to Xbox, which President of Entertainment & Digtial Media Nancy Tellem has overseen since joining the company in 2012. Meanwhile, Microsoft is still looking for a CEO to succeed the retiring Steve Ballmer.