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:
- Delete an entry from the list using OWA
- Login to mailbox via OWA
- Create a new meeting request (Has to be a meeting request only!)
- Begin typing the entry you want to delete until you see it in the Auto Complete list
- To remove one entry from the list, highlight the name in the Auto Complete list, arrow up and arrow down allow you to highlight the name you want to remove
- When the entry is highlighted, press the Delete button on your keyboard
- Delete the entire list using OWA Light
- Log in to mailbox using Outlook Web Access Light (Option doesn’t exist in full version)
- Go to Options -> Messaging
- Under Email Name Resolution, click “Clear Most Recent Recipients List”
- Delete the cache entries from the mailbox with MFCMAPI. Download this tool here. If you have more than a handful of mailboxes that you need to clear, it would appear that this is the only real option, otherwise logging into each user’s mailbox will be time consuming.
- Launch MFCMAPI on a PC where it has user’s mail profile that is not configured for Exchange Cached Mode from Outlook.
- “Session” menu->choose “Logon and Display Store Table”->choose mail profile in jumped window
- On the top-pane, double-click user’s mailbox and go to next window
- In the next window->right-click “Root Container”-> select “Open Associated Content Table”
- Scroll until you see the “Message Class” column. Right-click on the IPM.Configuration.Owa.AutocompleteCache entry and select “Delete Message”.
- In the “Delete Item” window select “Permanent delete passing DELETE_HARD_DELETE (unrecoverable)” from the deletion style drop down box, and click OK. This will permanently delete this message.Notes: It won’t prevent e-mail addresses from caching again in the future