You might have accidentally created a Mailing List Manager rule that is
moving your mail.
There are 3 different kind of rules in Entourage:
Mailing List Manager (MLM)
Junk Mail Filter
Rules (custom rules you create)
They run in the order listed above. The custom rules also run in the order
they are listed. (top runs first)
1) POP Rules act on a message ONLY when it first arrives in the Inbox (On My
Computer), NOT when it arrives in any other folder. Once it's moved to
another folder it won't be seen by rules.
2) IMAP Rules are meant to act on a message ONLY when it first arrives in
the IMAP INBOX, not when moved to another IMAP folder.
3) Exchange Rules act on a message ONLY when it first arrives in the
Exchange Inbox.
See "Using Rules with Entourage" for help and examples:
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http://entourage.mvps.org/rules/index.html>