The Radicati Group's latest study, <A HREF="http://press.arrivenet.com/tec/article.php/676701.html">IBM Lotus Messaging Software, Market Analysis, 2005-2009</A>, found that Lotus Domino's current market share of 23 percent (88.3 million mailboxes) is projected to drop to 13 percent (68 million mailboxes) by the end of 2009.