Jim Allchin: Retired
Besides Bill Gates himself, Allchin may have been the most important executive to depart Microsoft in recent years, having been responsible for the development and delivery of many of the company's products such as Windows and Microsoft .Net. Allchin joined Microsoft in 1990 to work on the software giant’s networking technology. He quickly rose through the ranks after working on the marketing and development of many product lines including various releases of Windows. In 1999, Allchin was promoted to group vice president of Microsoft’s Platforms Group, and in 2005 he ascended to the role of co-president of the newly created Platforms & Services Division (along with Kevin Johnson). After 17 years with Microsoft, Allchin officially retired on the day that Windows Vista was released -- Jan. 30, 2007.
Read into that what you will.