<A href="http://blog.vanessabrooks.com/2012/01/null-users-but-they-are-real-people-but.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+LotusEvangelist+%28Lotus+Evangelist%29" target="_blank">Keith Brooks has discovered, in Connections 2.5 and 3.0,</A> if you don't have a last name, you can't be set up as a user. He's posted links to documentation.