A discord client is now available for Windows XP and 2000. Now you can re-live those IRC days...sort of.
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GitHub - DiscordMessenger/dm: Discord Messenger is a free Discord-compatible messaging client targeting both new and old Windows.
https://github.com/DiscordMessenger/dm
Discord Messenger is a free Discord-compatible messaging client targeting both new and old Windows. - DiscordMessenger/dm
Well discord isn't completely comparable to IRC but the look of that client sure is!