Scott Charney, a former cybercrime prosecutor, will take responsibility for the security of the software giant's internal systems.
Scott Charney, currently the principal for digital risk management and forensics at PricewaterhouseCoopers, will become chief security strategist on April 1, overseeing the software giant's internal and product security policies.
Charney will replace Howard Schmidt, who has left his role as chief security officer at Microsoft to become vice chairman of the federal Critical Infrastructure Protection Board.
The White House refused to comment, as did Charney.
Before he joined PricewaterhouseCoopers, Charney served as the chief of the computer crime and intellectual property section of the U.S. Department of Justice, from 1991 to 1999.
Security has become a critical issue for Microsoft.
Despite several initiatives to secure the Windows operating system and Microsoft's major applications, bugs have still plagued the company.
Though many experts doubt whether Microsoft can successfully secure its products, they agree that the company must improve its record.