For the last week or so, I have been plagued by this “1 Unread Message” on my PPC's Today screen. This happens whether there is anything unread in my folder or not, and even when there is nothing whatsoever in my inbox.
I have done soft resets, and was contemplating doing a hard reset, when I decided to Google “pocket pc message 1 unread.” Turns out that I am not the only one with this problem. If you have been suffering through the same, then check out this free utility. :0)