How to Customize SquirrelMail
This document explains how some cPanel & WHM versions update the SquirrelMail webmail application, and how you can customize your SquirrelMail installation.
squirrelmail
How to Set Up Webmail Folders
You may need to perform certain steps in your webmail application in order to view folders that contain archived or Apache SpamAssassin™-filtered mail.
Importing SquirrelMail Address Books to Horde
This document describes the horde-squirrelmail-contacts-import-plugin plugin.
Importing SquirrelMail Address Books to Roundcube
This document describes the roundcube_squirrelmail_contact_import plugin.
Which Webmail Application Should I Choose
cPanel & WHM includes the Horde and Roundcube webmail applications.