Exchange 2010 OWA – Remove Cached Email Recipients/Auto Complete Entries

If you have any Active Directory users that have been deleted out but the addresses still show up in OWA or if you changed somebody’s user/email attributes and emails bounce back as undeliverable, this article is for you. I found this info here, the entries are stored in the user’s mailbox so the you can only delete them by doing one of the following:

  1. Delete an entry from the list using OWA
    1. Login to mailbox via OWA
    2. Create a new meeting request (Has to be a meeting request only!)
    3. Begin typing the entry you want to delete until you see it in the Auto Complete list
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