Upgrade From RH7.1

I have a laptop system running RH7.1 with KDE 2.1.2 and KMail 1.2. I would like to have my current email from this particular system transfered over to another system which I'm going to install Suse 7.3 (KDE 2.2.1 ...). Please be informed that I also have many "filter rules" set so I would need that as well. a) Is it possible for me to just install over my RH system? b) Is it possible for me to transfer pertinent (???) files/directories over to a new installation? Any suggestions would be appreciated. Thank You, Anthony