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Microsoft CEO Steve Ballmer holds two Windows phones as he speaks during the keynote address during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. - 

Microsoft announced Friday that its CEO, Steve Ballmer, will retire within the year. Ballmer has led the company at a difficult time for the tech giant, which has struggled to transition its products out of the PC era.

Marketplace Tech reporter Queena Kim joins Tech host Ben Johnson with a look back on Ballmer's tenure. Click on the audio player above to hear more.