Entourage Incorrectly Flagging Email as Junk?

Entourage uses the 'Junk' category to help users move classes of email into the Junk folder.  Sometimes unwary users will decide to rename the Junk category and use it for some other purpose-- after all, who needs a 'Junk' category, right?  The result will be that anything identified with that renamed 'Junk' category will be treated as junk!

A client had done exactly that, and then made her own contact a member of the renamed category.  The result was that every email she sent was moved to the Junk folder rather than the Sent folder.  The emails were sent out from her computer okay, they just didn't go to the correct folder after sending.

The fix was to rename the category she had renamed back to 'Junk', then un-categorize everything she had identified with that category.