Former Microsoft president Jon Shirley has announced his intention to retire from the company in November.
Shirley was president of Microsoft from 1983 to 1990 and oversaw the company's expansion from a simple operating systems supplier to a global software force.
He stepped down from the role of president in 1990 but has remained on the board of directors.
"Having turned 70 this year, I am at a point in my life where I want to reduce my professional commitments and allow more time for some of my personal interests," Shirley said.
"I could only make this decision knowing that Microsoft is well positioned for success in the years ahead.
"I have the utmost confidence in the leadership of Microsoft and believe we have established the strongest board in the history of the company."
Shirley lists his hobbies as collecting, restoring, showing and racing vintage Ferraris and collecting contemporary art.
He spent 25 years at Tandy before joining the fledgling Microsoft and has been closely involved with its development ever since.
Shirley famously refused to upgrade his second computer to Windows Vista after his negative experiences with the first one.
Steve Ballmer, chief executive at Microsoft, said: "It has been my privilege to work with Jon in multiple roles at Microsoft over the past 25 years.
"We are grateful for his incredible leadership and dedication and fully understand his desire to retire considering his extensive service to the company."
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