Outlook sometimes marks folder with one unread message [duplicate]

Workaround: Right-click folder -> properties -> Click "Clear Offline Items".
- All items disappear - yikes!
Now close & re-open Outlook - folder will re-sync from server, and without the unread mark.

My workaround:

In the "Search Current Mailbox (Ctrl+E)" box, type: read:no and hit Enter.

Then when it shows, "Find More on Server" link, click it. The unread email should appear. Make sure you click on it if it doesn't automatically switch to read.

Click the "X" in the search box to clear the "read:no" search -- it does not work if you do any other operation, including clicking on another box, at this point!

Frustrating, but fixable, thankfully.

I found this usually happened when someone on your network sent a message, then UN-sent it. You can ask your admin person to turn it off, but I think it's on for a reason.

The answer above would definitely reset the counter. I can't remember in outlook, but I know in my email program at work (first class), I can right click the folder, choose "Mark as Read", and the system does a manual recount to zero