This is what it exactly says
Choose a type of operating system <<<HEader
Choice per feature<<one of the lists
1.Hosting: Web / Emails / VPN / VoIP --Release 2, Release 1, Linux Plesk 8.4, Linux Plesk 8.0, Cpanel, Extranet Group Work, Easy Streaming, Windows Plesk 8.1
2.Experts: raw distro-- Debian : Etch Stable, Ubuntu Server 8.04, Open Suse 10.2, Fedora Core, CentOS, Gentoo, Slackware, Free BSD, Windows 2003 Pro, Windows 2003 Basic
3.Virtualization---VMWare, Xen, Proxmox
4.Remote desktop---Ubuntu Desktop 8.04
Choice per distribution<<<Second list
1.Linux---Release 2, Release 1, Linux Plesk 8.4, Linux Plesk 8.0, Cpanel, Extranet Group Work, Easy Streaming, Ubuntu Desktop 8.04, Debian : Etch Stable, Ubuntu Server 8.04, Open Suse 10.2, Fedora Core, CentOS, Gentoo, Slackware, VMWare, Xen, Proxmox
2.Windows---Windows 2003 Pro, Windows 2003 Basic, Windows Plesk 8.1
3.Free Bsd---Free BSD