Erros Mail Boxes Archived without any command


i’m having a broblem with my MIaB, some mail accounts are being archived without any command from administrator account. how this is possible? and when i try to add the account again the anser is that the user already exists.

can someone help?
currently the are 569 mailboxes with 69 archived on the system. are there some limitation to 500 users?

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There is no such limitation that I am aware of.