Comment Re:Windows uses NTP now? (Score 1) 287
Yes, ActiveDirectory time is synced via the NTP protocol.
ActiveDirectory is a collection of protocols, most of which are based on public standards, NTP, LDAP, Kerberos, ect. Plenty of Microsoft Proprietary piled on top too.
You can point any NTP client at an active directory server and sync from it, just like you can use it for a kerberos realm out of the box, and with Services for Unix installed on your AD server, the schema is extended to support the various Unix attributes required to use nss_ldap and pull full user account info from it.
Windows machines not on a domain will also be happy to sync from a normal NTP server like pool.ntp.org as well, though they use time.windows.com by default.