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Microsoft has set Oct. 31 as the end of sales of new consumer-grade Windows 7 PCs, but for now has left open the do-not-sell-after-this-date for business machines



From Computerworld:
On the site where it posts such policies, Microsoft now notes that Oct. 31, 2014, is the end-of-sales date for new PCs equipped with Windows 7 Home Basic, Home Premium or Ultimate. All three are consumer-oriented versions of Windows 7; Home Premium has been the overwhelming choice of OEMs (original equipment manufacturers) for consumer systems.

Microsoft's practice, first defined in 2010, is to stop selling an older operating system in retail one year after the launch of its successor, and halt delivery of the previous Windows edition to OEMs two years after a new version launches. The company shipped Windows 8, Windows 7's replacement, in October 2012.
  Microsoft sets Oct. 31 as stop date for Windows 7 consumer PC sales