Sounds like you're looking at a view or search folder that's filtered to show only unread items.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> All of a sudden today when I hit reply to messages in my inbox, or forward
> messages in my inbox, they are automatically removed from my inbox. Of
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> do this today. I cannot find any reference to this in the help file online.
> I do NOT have it set to view unread messages only.