Sometimes Outlook will display that there is 1 or more unread emails however when you look in the unread email folder there are none. By following the steps below you can find those emails and mark them as read.
- In the “Search Current Mailbox (Ctrl+E)” box, type:
read:noand hit Enter.
- When it shows “Find More on Server” link, click it. Then the unread email(s) should appear.
This works with Office 2010, Office 2013 and Office 2016.