Update: I found another server (running Windows Server) that had an old version of PHP when I tried hosting the website on this server, it worked.
Although this is somewhat of a success and allows me to completely retire the old Linux server, I am still very interested in migrating the website to the ISPConfig server if possible since the Windows Server is nearing retirement as well. Not to mention, the Windows server doesn't have MySQL installed on it so it's currently using the ISPConfig server as a database server which will create confusion in the future.
Once again, is it possible to install PHP 5.1.0 on my ISPConfig server?
Last edited by supanatral; 9th March 2013 at 22:08.