Solaris has, historically, been my favorite operating system. I started using it when Sun made Solaris 7 available for free to anyone who requested it when I was in college. I still remember receiving a package in the mail with a nice set of packaged CDs and documentation! My college had standardized on Unix for development for homework assignments, and Linux at the time still seemed "immature" to me. I loved the stability and sanity I found with Solaris, and even saved up money to beef up my home PC so that it could run better (SCSI hard drives, more RAM, etc.) I used it up through version 10, but once Oracle took control and de-open-sourced it, I knew that was the beginning of the end.