We also sell a self hosted PHP/MySQL app. Here's what we've found so far: - Other OS: Windows, OSX at least. - Prepackaged environments: WAMP, XAMPP, MAMP. -

We also sell a self hosted PHP/MySQL app. Here's what we've found so far: - Other OS: Windows, OSX at least. - Prepackaged environments: WAMP, XAMPP, MAMP. - PHP Modules that are not normally installed and that your app is using. - How PHP works with Apache: mod_php, filters, CGI/FastCGI. - NGINX. - PHP interface with MySQL (mysql, mysqli). We only support mysqli but it's not always installed. Other times no support for MySQL is installed. - Other databases if you allow them. - You're probably not developing with the latest versions of PHP/MySQL, so check also incompatibilities with newer versions. - Sessions / Cookies. - Time settings can give problems also: different timezone between the server and PHP. These are the ones I could think of right now. Installation is, by far, what's going to cause you the majority of support issues. You app seems interesting, do you have anything to show?