<< Problem >>
You have given yourself full access rights to an user's mailbox. But now, in your Outlook, you have their mailbox and you cannot remove it. Their name does not appear in 'open additional mailbox'.
<< Solution >>
You need to go into ADSIEdit.msc, Domain context, and drill down to the account you wish to be removed from, and look for the "MSExchDelegateListLink" attribute and remove yourself from that list. The next time you start Outlook, the ghost "additional" mailbox should disappear after a few minutes.
Reference:
Cannot remove additional mailbox
https://social.technet.microsoft.com/Forums/office/en-US/87637d40-3801-4282-9df1-e519759aee07/cannot-remove-additional-mailbox
To remove an additional mailbox in Outlook, go to File > Account Settings wootingdoublemovement Email tab > Change > More Settings > Advanced tab, then remove the mailbox from the "Open these additional mailboxes" section.
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