AndyReed said:
If these guys are using the cPanel, then they must did some serious work to get a second instance of Squirrelmail up and running. Although I've never done this before, but I think you might have a port conflict, if you install another copy/instance of Squirrelmail on a cPanel server.
Serious work? Port conflict? What on earth are you talking about?
Just create a subdomain in cpanel, for the account you want this for (or you could do it for the server's owner account, and make it available to all clients on that server)
So creat a subdomain, let's say you call it "email", dor the domain domain.com
ssh to the box, go to the directory /home/domain.com's username/www/email
download the latest stable copy of squirrelmail, gunzip-it, and it will probably create a folder called squirrelmail-1.x.x there. Move the contents to the of that folder in the "email" folder.
from the shell, configure squirrel. (in there's a conf.pl file, run it)
it is very easy to set up, after you did that, chmod the email/data dir to be able to write in it, and point your browser to
http://email.domain.com . It should redirect you to email.domain.com/src/login.php
Login with email addy and password, and that's it.
works for ALL email accounts on that server, not just for the ones on domain.com