What ist UMA? (...feature not available in this version...)

What ist UMA?It is a part of “hUMAna”, but i cannot understand the errormessage in the logfile:

repl evdom03/humana/de mail

27.05.2004 16:33:13 UMA: The feature you have chosen is not available in this version of Notes. To access this feature, you will need to install the shipping version of Notes