Blizzard Ending Support for Windows XP and Vista

Blizzard have announced that they are ending support for older versions of Windows. Once the support ends games such as World Of Warcraft, Starcraft II, Diablo III, Hearthstone and Heroes Of The Storm will no longer function on Windows XP and Windows Vista. Windows 7 and 10 remain unaffected by this change.
Blizzard have posted on their battlenet forum that this change will roll out on a staggered schedule and they will post notices when closer to each games cut off date for XP and Vista.
Stay tuned for updates regarding cut off dates.
Source: Battlenet