That's subscribers, not accounts. I'm looking at you, Linden Lab.

According to Worlds In Motion, World of Warcraft has recently passed the 10 million worldwide subscriber mark.

Blizzard Entertainment has announced that World of Warcraft has recently passed 10 million subscribers worldwide since its launch on November 23, 2004. According to Blizzard, WoW now hosts more than 2 million subscribers in Europe, more than 2.5 million in North America, and approximately 5.5 million in Asia.

Continue reading at Worlds In Motion.