Sun Microsystems Inc is crowing over the success of its internet mail server, SIMS. Though SIMS has yet to celebrate its first birthday, Sun claims it has already sold 5 million mailboxes. Infoseek Corp has adopted the server as its email offering of choice. Now SIMS 3.5 has been released, with a better MAPI client and web access via HTML. It’s a bit early for Sun to break out the champagne, though. The vast majority of internet mail servers still run one or other of sendmail or its successor qmail, and with SIMS starting from $1,496 you can’t argue with their price. Qmail and sendmail are free.