I need some help. I recently purchsed a server and I am in the process of moving over all of my member data and content from my old server from another datacenter. On my old server we used squirrelmail, and all of my members have became used to it, and I would like to continue using it. I noticed that by doing to "http://domain.com/webmail" you can access the shared squirrelmail software on the server. Now I will explan what I am having trouble with.

Before when I moved servers, all I did was copy the user's pref files and the files that contained their special folders that they created. On my old server, I used ensim for the control panel and ever web user has a directory located in home where their special folders were created. Now on plesk I dont know where the folders are located, and every time a user logs in and attempts to make a new folder their get an error saying the mailbox does not exist. I dont know where squirrelmail is attempting to write the data at, or if there is a chmod incorrect. I need help.

Also there is a mail program called "horde" and I have no idea how to access it, or anything about it at all. If somebody could share some info on that, it would be appreciated also. In plesk under the domain there is an icon that says "webmail" when I click it, a blank pages opens in a new window. What is that supposed to do, or what is it for? Please give me any advice you may have, it would be appreciated.

Horde is the webmail used by Plesk. When you configure mail in Plesk for a domain, it configured Horde. The reason that the page popped up blank for you is probobly because it is not set in the DNS configuration of your nameservers. Each domain geta their own subdomain for Horde: http://webmail.userdomain.com. In here you just type in your username and pass and (in the words of Tony Soprano), Badda Bing!

You can try it out on my server at http://webmail.richgannon.net
You (and anyone else interested) may use this login information:
Username: test
Password: servermatrix

You can control the email settings at:
https://richgannon.net:8443
Username: test@richgannon.net
Password: servermatrix

Okay, that was easy enough. I like horde. One more final question that goes along the lines of this. Every time I send an email using horde, it has this footer on it.

"This message was sent using IMP, the Internet Messaging Program."

Is there any way to get rid of that?

edit the trailer.txt file in the directory /home/httpd/vhosts/webmail/horde/imp/config

There is a nice fat Admin FAQ Here:
http://www.horde.org/faq/admin/config/index.php

Alrighty, I got it. Thanks a lot!