Dating the Ultima Online Demo
To our knowledge the Ultima Online Demo can only be found on the Ultima Online Gold CD which was released around august 1998.
There is some contradicting evidence related with the age of the code inside the UO Demo. Based on comparing the decompiled scripts with the Publish patch notes on  we have found that the demo server code is based on the patch from April 1998 but some patches (not all) from the June 1998 patch are also included. The client side of the uodemo.exe is, however, older: lack of support for 800x600 resolution, the layout of the options menu is different, remainders from the login encryption tell us the code is based on the older 1.23.xx clients.