UPDATED: John W. Thompson, the CEO of antivirus and security software company Symantec, will retire from the post as of the end of the company's fiscal year, the company announced today.

Thompson, 59, will be replaced as CEO by Enrique T. Salem, the company's chief operating officer, but will remain chairman of the board of Symantec (NASDAQ: SYMC).

Salem, 43, will also take on the office of president, and will join Symantec's board of directors.

"I've always believed planning for succession and ensuring a seamless transition was one of the most important parts of my role as CEO of Symantec," Thompson said at a press conference called to announce the management changes. "I've been working on this for the past two years."

He described Salem as an outstanding business partner and a significant contributor to Symantec's success, who has built up strong relationships with the company's employees, customers and partners and has worked closely with him in shaping corporate strategy.
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