cPanel webmail users may have noticed that Squirrelmail is no longer available as an option. The cPanel developers have removed Squirrelmail in the latest updates. This is their reasoning:
Why SquirrelMail is being removed
An all too common story with open source projects is a loss of invested developers. A once active, vibrant developer community diminishes as other things take priority. When that happens, its users often leave as well.
SquirrelMail’s last update was May 30th, 2013, with their last release on July 12, 2011. In that seven years, 4 versions of PHP have reached End of Life, and we have worked with others in the community to maintain SquirrelMail.
Unfortunately, recent security patches have significant problems, forcing us into a choice. Exclude the security fix and ship SquirrelMail with known security flaws, ship a secure version with known interface issues, or attempt to fix the problems. Webmail users now expect a better experience than SquirrelMail provides. Rather than continuing to ship an unmaintained application, we decided to remove SquirrelMail.