At work we have to use webmail that runs on www.ipswitch.com iMAIL. There are at least 3 things that don't work with with Kmeleon and iMAIL webmail. 1st is attachments box does not show up, 2nd is address book scrolling, 3rd is (the biggest problem) sending mail does not work. To access a demo of ipswitch iMAIL webmail system go to http://www.killerwebmail.com/
I would rather not use iMAIL, but for work I have to.