Thanks to a fierce marketing campaign as well as years of positive showings at E3, Age of Conan has made quite a splash in the PC community since its release last week, having sold 400k units according to GameDaily. This makes the game one of the fastest-selling PC games in history, which becomes even more impressive when you consider that it's an MMO.

It's encouraging for MMO developers to see another MMO besides WoW doing well. If Age of Conan can build momentum and continue to gain subscribers, it could send the message that you don't have to be able to take on WoW to be successful.

While it's unlikely that anyone can challenge Blizzard for control of the MMO market right now (well, maybe if you have a billion dollars), successful releases of future MMOs such as Warhammer Online as well as the continued success of Age of Conan could start to slowly erode Blizzard's subscriber base.

For now, it'll be interesting to see how Age of Conan performs in the coming weeks.

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