Categories keep changing

[Reney]

Title: Categories keep changing

Hi,
    I lost all my e-mail, so I copied the exported saved material. I figured out all the glitches that resulted except for the categories. Every time I get new mail, the categories change to the same category. Obviously, this is the default category, but I don’t know how to change it.
    Thanks,
Reney
G4, OS10.3.5
Entourage  11.2.5