well if you actually read the instructions on how to install squil, you can do it without perl. most people know jack about perl but yes, there's a few things to do before you can set up..
here's the instructions for all the newbs like me.
http://www.squirrelmail.org/wiki/en_US/ ... uirrelMail
"Windows administrators: You are encouraged to use SquirrelMail, but many of the PHP files were unintentionally written for UNIX or Linux distributions. For example, you must have Perl installed if you want to use the installation script (conf.pl). But even if you don't install Perl, you can manually edit your configuration file located in C:\YourWebDir\config\config.php. And for many administrators, this will work fine! Also, if you install Plugins, you might need certain UNIX or GNU utilities."
I would also suggest reading the requirements section for windows users.
http://www.squirrelmail.org/wiki/en_US/ ... quirements