I've been using squirrelmail for years and its been getting the job done
just fine.  I've been thinking about trying roundcubemail because its UI
seems interesting.  The only thing I'm hesitant of is that it needs a
database.  I haven't researched it enough to determine if its storing the
mail messages in the database or not. If it is, I won't bother with it.

-- 
Kathryn
http://womensfooty.com