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The server actually does have a routine account cleanup which it uses to clear out any old data (including groups) from inactive accounts after a certain amount of time of inactivity. The accounts remain in the system so long as they were properly activated, but the data in them is cleaned out to help the server process more relevant data for those who are actually playing the game.So, I believe after about 18 months of inactivity on an account (I'm pretty sure, but either way it means you'd have to be VERY inactive, practically guaranteed to not come back), it will be automatically reset, like you can do at the bottom of the User Panel on the forum. This means groups will be cleaned out, and thus opening up more group names.