Nostalrius
Nostalrius was a private World of Warcraft server, which opened on February 28, 2015. The server ran Patch 1.12, catering to aficionados of the early version of the game, nicknamed "Vanilla". Stating breach of copyright, Blizzard Entertainment issued the administrators of the server a cease and desist letter, and so the Nostalrius server was shut down on April 10, 2016, leading to outcry on Facebook and Twitter and large-scale coverage in mainstream computing journalism.
It was one of the most successful private servers to date with over 800,000 accounts registered. After the conclusion of Nostalrius servers, a discussion about the possibility of Blizzard opening official "Legacy" servers had begun.
Discussion of legacy servers
The launching of the private Nostalrius server brought the issue of "vanilla" legacy servers to the forefront of discussion for World of Warcraft. A petition on Change.org received over 280,000 signatures pleading Blizzard to hear the voices. Many famous YouTubers have made videos on this very topic discussing the pros and cons of Legacy servers, and it managed to get the attention of one of the middle managers of World of Warcraft, Mark Kern, who supports the idea of Legacy servers. Blizzard Entertainment was silent on the issue until April 25, where the lead game developer responded to the discussion.Blizzard's response
On April 25, 2016, J. Allen Brack responded to the Nostalrius discussion. He spoke of the possibility of "Pristine" realms, with many of the new features turned off, to make leveling harder, and social interaction more prevalent in the game.On November 3, 2017, Blizzard announced World of Warcraft: Classic, an official "vanilla server", in response to the popularity of Nostalrius and Elysium Project. It was released 27 August 2019.