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Private server Nostalrius had been built solely around hosting World of Warcraft's first ever retail edition, which is also widely regarded as "Vanilla World of Warcraft". Blizzard has been, for over 10 year's, releasing occasional expantion's toward's World of Warcaft every once in a while. Whilst these drastically changed core mechanic's of the game, they also brought new life into i't as well. As World of Warcraft grew more and more apart from it's original counterpart, the demand for legacy server's grew more and more as well.
The team that surrounded Nostalrius Begins had been composed of about thirty volunteers, whilst the server itself accumulated roughly around 800,000 registered player's, i't also achieved an active playerbase of around 150,000 player's.
As of recently, their service provider had received a formal letter written by french and US lawyers asking them to shutdown their services because of Copyright Infringement prior to a lawsuit. As soon as this information had been received, the final shutdown of their World of Warcraft realms was planned, as requested.