We can install popular Linux distributions (Debian, Ubuntu, or CentOS) on the server you've ordered.
You will need to purchase a license from us to install the Windows Server OS.
To install any other OS, we will need to connect IPKVM, which is a paid service. You will also have to provide us with an OS image available via a direct link. You might as well need to provide a license for the OS you'd like to be installed.