The Unread Mail folder is a Search Folder which only displays unread
messages. Once you've opened the message, it will no longer be displayed
there but will still exist in the real folder that you received it in; for
instance the Inbox folder.

Additionally see;
http://www.msoutlook.info/question/322

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Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more

http://www.msoutlook.info/
Real World Questions, Real World Answers

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"Colin McLellan" Colin wrote in message
...
I have had no problems with Outlook Express for the past 8 years, but
recently an occasional email goes directly into "Unread Mail" and when
opened, then disappears from the system.