Does 5.6.3 delete deprecated services? - Apple Support Community
(Caching Server, File Sharing, Time Machine Server) macOS Server 5.6.3
(Mail, DNS, DHCP, VPN, Websites, Wiki, Calendar, Contacts) Does 5
As a legacy version, 5.6.3 has developed several significant maintenance challenges for those still running it: Time Machine Server) (Mail
It served as a preparation point for the subsequent macOS Mojave-compatible version (5.7.1), which removed the vast majority of server features. The "Deprecated Services" Turning Point
and integrated directly into the standard macOS System Preferences. Critical Post-Release Issues (2020–2025)