[mrits]

The most popular server for years was named after the word nostalgia. A lot of people had a really fun time playing WoW as a kid but had no actual way to play the game any longe since it was online only and ever evolving.

After a decade or so Blizzard finally caved and released their own "classic" versions of the game. Apparently a lot of the infrastructure was incompatible with the software which made it a not so trivial undertaking. They originally said it was impossible but nostalgia hit one of the internal devs and he proved otherwise.