From Exile to X11: A Journey Through Time
Subject:   MacOS 9 Had X Servers
Date:   2003-03-15 06:09:50
From:   bbum
Response to: MacOS 9 Had X Servers

But OS 9 did not have any of the features of a modern Unix server and, hence, the X environment on OS 9 was crippled. While the X servers on OS 9 could do a wonderful job of displaying remote X sessions, they could not easily take direct advantage of many of the X based applications; you couldn't run many of hte X based apps directly on the OS 9 platform without there having been a difficult porting effort.

End result; the OS 9 based X platform lagged behind the rest of the X community. This is not true of the OS X X environment.