[newbie] Upgrading RedHat?

[Patrik Nylund]

Hi.
Is it possible to upgrade from RedHat 7.0 to Mandrake 7.2 without loosing
too much information?
What kind of info do I risk to loose?
We've got qmail with vmail and courier on that machine right now and we
don't look forward to loosing all the mail and accounts or the
configurations.

I'd be grateful for any help or comments onthis.

/Patrik