Microsoft Entourage database rebuild unlinks folders from rules
A common troubleshooting technique for resolving problems with Microsoft Entourage is to Rebuild the Microsoft Entourage database.
This process unlinks folders from any rules (either defined normally or in the Mailing List Manager). If you have rules that move or copy messages into folders, you will need to fix the rules before they properly process messages.
Until you fix the rules after rebuilding the database, you will receive errors from Entourage as you receive new mail. You must relink each mail rule to the folder where messages will be filed.