Linux
The next best thing since DOS (TM)
Linux has really made a stake in the internet. With linux being free no wonder so many web servers run linux than any other operating system. And the best part about linux is the strong community who supports it. I have been working with Linux since 1998. I have experience with all forms of Redhat, CentOS, Fedora, SLES, SuSe and Caldera. In addition, I have over 7 years in Linux server administration ranging from apache services, email to MySQL.