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Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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If just AD account is disabled I see two possibilities-
1- There shall be a delegate with SendAs or sendon behalf rights sending this invite intentionally or unintentionally.
2- An old meeting request where the organizer is the so called disabled user, is updated by respective user delegates.
or there is a also a possibility that a synced device (ActiveSync) involved here.