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Microsoft - keep your filthy hands off Valve, leak shows MSFT would buy Valve
(www.gamingonlinux.com)
Steam is a video game digital distribution service by Valve.
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Yeah, would take ages to recoup the cost. Plus, you might not even recoup the cost as markets may change or Steam gets mismanaged by new management. Strategically Steam and Valve would also offer little advantage to Microsoft for the price.