Corrected version

Longtime Microsoft marketing head Mich Mathews is leaving the company.

Mathews, senior vice president of the Central Marketing Group, will retire at the end of the summer after 22 years at Microsoft, the company said Wednesday.

It's clear that Microsoft is flushing several longtime veterans as the company's stock price is caught in a decade-long stagnation and investors are complaining about Chief Executive Steve Ballmer's leadership. Other veterans who have left in the past two years include: Bob Muglia, former president of the Server and Tools division; Robbie Bach, former president of Entertainment and Devices division; Ray Ozzie, chief software architect; and Chris Liddell, former chief financial officer. Stephen Elop, former president of Microsoft Business Division also left to run Nokia.

They have been replaced by a younger generation of leaders: Satya Nadella became president of the Microsoft Server and Tools division; Andy Lees is now head of the mobile group; Don Mattrick is in charge of the Xbox business; Peter Klein is chief financial officer. Steven Sinofsky, president of the Windows division, is also part of this generation.

Microsoft said in a statement: "Mich has been instrumental in driving growth of the Microsoft business while also building the Microsoft brand, which consistently has placed in the Top 10 of many brand strength and image indicators."

The company has not announced who will replace Mathews. She was responsible for public relations during the launch of Windows 95, one of the most successful marketing campaigns in Microsoft history.

Information in this story, originally posted on March 30, 2011, was updated on April 1, 2011, to clarify that Mich Mathews was responsible for public relations during the launch of Windows 95.