This is a kind of myth that needs to be cleared.
NTP can be installed and is supported on a server OS.
IN the days when RTM was relased i am taking about 2007 then we used to say this but now NTP can be installed on all SERVER OS 32 bit as well as 64 bit.
The "Scan for trojans and worms" and the "Scan for keyloggers" options are currently not supported on Windows server operating systems or 64-bit Windows that is the reason the PTP will say off or waiting for updates. In simple words only A COMPONENT OF SEP is not supported on the server OS , it does not mean that entire PTP is not supported.