Microsoft announced some new leadership promotions today. The company promoted Kurt DelBene to president of the Microsoft Office Division, Andy Lees to president of the Mobile Communications Business, and Don Mattrick to president of the Interactive Entertainment Business.

"Today’s promotions underscore the strength of Microsoft’s collective leadership team and set us up well to execute against a powerful lineup of products this fall," said CEO Steve Ballmer. "Not only is the team ready to capitalize on major momentum with our existing products like Office, SharePoint and Halo: Reach, but they are simultaneously bringing entirely new experiences to market with Windows Phone 7 and Kinect for Xbox 360."

DelBene has been with Microsoft for 18 years. Most recently, he led the engineering and development teams for the Microsoft Business Division, including the development of the recently launched Office 2010 products and services.

The company is quick to point out that Office 2010 has already become the fastest selling consumer version of Office. As president, DelBene assumes responsibility for the Microsoft Office Division, including both the engineering and marketing functions for clients, servers and services for information workers, including Office, Exchange, SharePoint, Lync, Project, Visio and Microsoft’s speech technology investment.

Lees has been with the company for 20 years. He has been at the center of the development of Windows Phone 7. He’ll continue to oversee the overall product development and marketing of the company’s mobility efforts. 

Mattrick doesn’t have as much history with the company,having joined in just 2007, leading the Interactive Entertainment business for Microsoft. He’ll oversee Xbox 360, Xbox LIVE, Kinect, Zune Music and Video, and Mediaroom, as well as PC and mobile interactive entertainment.