1. Windows Server
22.44%
2. CentOS
9.97%
3. UNIX
8.65%
4. Fedora
3.20%
5. Ubuntu
1.18%
6. Red Hat
1.05%
7. FreeBSD
0.37%
8. Debian
0.17%
9. Scientific Linux
0.03%
10. SUSE
0.02%