In October, Blizzard will begin the process of ending support for Windows XP and Windows Vista in World of Warcraft, StarCraft II, Diablo III, Hearthstone, and Heroes of the Storm. The games will not run on these older operating systems once they are no longer supported, so the company is encouraging any players who are still using one of the older OSes to upgrade to a newer version.



Starting in October of this year, we will begin the process of ending support for Windows XP and Windows Vista in World of Warcraft, StarCraft II, Diablo III, Hearthstone, and Heroes of the Storm. Microsoft ceased mainstream support for these versions of Windows in 2009 and 2012, respectively, but since a decent portion of our audience was still using them at the time, we continued supporting them. However, there have been three major Windows releases since Vista, and at this point, the vast majority of our audience has upgraded to one of the newer versions.

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Source: [H]ardOCP – Blizzard Ending Support for Windows XP and Vista