A record 28,800 users running off a single copy of <A HREF="http://www.notesbench.org/">Lotus Domino</A> on an IBM RS/6000 server with the AIX operating system was measured using the Lotus NotesBench standard. The record 28,800 mail users was set on an RS/6000 EnterpriseServer S70 with 12 Northstar processors. It uses the AIX 4.3 operatingsystem and Lotus Domino 4.6 server software. In the NotesBench testing, the average user response time was measured at less than one second. That measurement indicates that each command to open an e-mail note, for example, was executed by the server in less than one second.