Lotus announced this week that Lotus Domino R5 will now run on the <A HREF="http://www.zdnet.com/pcweek/stories/news/0,4153,1015620,00.html">IBM S/390</A> server. PC Week reports that IBM officials said Lotus Domino R5 for IBM S/390 can support up to three times as many users as Domino R4 for S/390.