Microsoft quietly put an end to sales of Windows 7 licenses to computer makers this week, marking a major milestone for the seven-year-old OS.

According to Microsoft’s rules, the Redmond, Wash. company stopped selling Windows 7 Professional or any version of Windows 8.1 to OEMs (original equipment manufacturers) as of Oct. 31.

The end of Windows 7 and Windows 8.1 left only Windows 10 as a long-term choice for OEMs that pre-load Windows on their wares.

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