In Outlook 2016 (running on Office 365 mail), If I highlight the "inbox" folder, the 'Items' count shows 95 but the 'Unread' count shows 91. If I log into the OWA, the Inbox matches with the 91. I don't know what the 4 items are.

Also, I am unable to mark all as read and see what remains due to this being a shared mailbox.

  • Try toggling offline mode – DavidPostill May 11 '16 at 15:51
  • Tried running in online only mode and then re enabling cache mode, no change. – AlexM May 16 '16 at 13:33

Just close Outlook and delete the OST file that is associated with mailbox. Start Outlook, it will synchronize the mailbox again and you shouldn't see these "extra" items anymore.

  • I tried the steps you suggested, however no change. I also built the same user profile on a totally different workstation and the same error was happening. – AlexM May 16 '16 at 13:34

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