My Calendar has unread items!

I am having a strange issue with my outlook calendar. I was sent a meeting
request as a .ICS attachment, once opened and saved, it showed up as 4 unread
items within my calendar. Here's what I've tried so far...

1. Advanced find for unread items
2. Advanced find for all items
3. Tried opening my Mailbox using "Outlook Web Access"
4. Tried opening my Mailbox on another computer
5. Change my calendar view to various different views
6. Erased all items from my calendar

None of the above has helped me find any items that are actually unread.
I've been. Does anyone have any suggestion of what I might try next? I'm
opened to any sugguestions. Thanks.