Registry Vista Mail Rules

Can anyone tell me where in the Registry can I find values that affect
Windows Mail Values and behavior and rules?

I need this information in connection with my problem with Windows Mail
rules which used to allow me to "delete it from server" of mails but
right now is not working for me. I was successful in using "delete it
from server" to prevent defined mails from ever being downloaded to my
computer for years now. Then the last few months it does not work
anymore. Other suggestions have not worked.