Getting back to your question, I just went throough the procedures that the
upgrade put me through. I downloaded the program from the site, it started
the installation and said it appeared that I had an existing installation and
asked if I wanted to perform an upgrade (I'm pretty sure that's how it went)
and I then accepted all the defaults.
One other itneresting thing is that all my Hotmail messages are there, but
all of my messages on my one POP/SMTP account are gone.