If it passes the MailItem test it will be some variation of *.IPM.Note.*.
You can set the folder to a bottom reading pane view and customize the view
to see the exact MessageClass. Depending on the server and the source of the
message it could really be anything.

An undeliverable message that I get from my Exchange server has a
MessageClass of "REPORT.IPM.Note.NDR"

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"PJFry" wrote in message
...
Figures it out. What I was trying to do was count the number of unread
items, specifically Undeliverable mail. In this case, exactly half of the
messages were undeliverable. The code is supposed to look at MailItems,
which I am guessing undeliverable mail is not. Once I cleared those
message
out, I got the result I was expecting.

So that begs the question, what kind of an item is undeliverable mail?