Solved Stuck email counter on Metro Mail

I am using both WLM and Metro Mail and there appears to be an email stuck somewhere but I cant find it. The email was an invitation to an event on facebook which I maybe'd then deleted. I have checked all the folders on Metro Mail and it is nowhere to be found but it shows up on the live tile with subject and a count of 1. Also the Lock Screen constantly shows 1 email unread but I can find it. Anyone know how to clear this?

Tim

Microsoft answers doesnt seem to be available but google says others have had this problem. So I went to the Start Screen, right clicked "uninstall". Went to Store to re-install it but when I did it said there was a problem with Mail and Store would attempt to repair it.

After the repair it seems back to normal, all my accounts are the same as before minus the notification of an unread mail, Windows Mail is using IMAP and WLM is using POP3 for the same account just for info on the account that was stuck.