Sun Microsystems, Inc. today announced that Sun Internet Mail Server software has the <A HREF="http://www.sun.com/sims">lowest</A> total cost of ownership (TCO) versus competitive messaging products. Sun Internet Mail Server was found to be 45 percent less expensive to own and operate than competing products according to a new report from the Radicati Group, Inc., a messaging industry analyst firm. Sun also announced that its messaging platform continues to gain momentum with nearly 10 million mailboxes sold since first shipping the product just over one year ago.