If you want to go 100% free there is a "community supported" (AKA use it at your own risk) branch of the driver (8.x-1.x) that we had been working on before moving to 8.x-2.x. The 8.x-2.x is a full refactor that solves deep core issues of the original driver. Migrations from 8.x-1.x to 8.x-2.x have not been tested and are not supported, so if you start building something on 8.x-1.x make sure to set aside some budget to put off some tough fires. If you are using drupal for brochureware the free version might do the job.
To get a copy of the PhpMSSQL library use the link in the main navigation menu of this site, or here:
http://www.drupalonwindows.com/en/content/phpmssql
If you want to go 100% free there is a "community supported" (AKA use it at your own risk) branch of the driver (8.x-1.x) that we had been working on before moving to 8.x-2.x. The 8.x-2.x is a full refactor that solves deep core issues of the original driver. Migrations from 8.x-1.x to 8.x-2.x have not been tested and are not supported, so if you start building something on 8.x-1.x make sure to set aside some budget to put off some tough fires. If you are using drupal for brochureware the free version might do the job.