This version is the ultimate release for macOS High Sierra 10.13.6 .
and integrated directly into the standard macOS System Preferences. Critical Post-Release Issues (2020–2025) macOS Server 5.6.3
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 This version is the ultimate release for macOS
(Mail, DNS, DHCP, VPN, Websites, Wiki, Calendar, Contacts) macOS Server 5.6.3
The defining characteristic of version 5.6.3 is how it handles traditional server services. This version began the process of services from new installations to signal their upcoming removal. Feature Type Status in 5.6.3
for new installs; fully functional for existing upgrades. Management Tools (Profile Manager, Open Directory, Xsan) Active and supported as the primary focus.