Help Email Unread Notification count never resets

[Millybat]

I use the default Email application to pick up work emails from an Exchange server. Whenever I get a new email and swipe the notification blind down to see the notification, the number of unread emails it says I have on that account goes up by one each time. I only have one unread email in that account but the notification for the test email I just sent myself says that there are 21 unread messages.

It seems as though the internal counter just isn't being reset when I actually go in and read messages. Is there a fix for this or anything I can do to sort it out?

Obviously not a showstopper of an issue, but pretty annoying!