Last I checked in June, Zimbra, Yahoo’s open-source e-mail and calendar software, was at 11 million paid mailboxes. This was a healthy jump from 8 million paid mailboxes in May 2007 and the 4 million paid mailboxes TechCrunch reported back in October 2006. Well, on Monday The VAR Guy reported there are 20 million paidContinue reading “Zimbra hits 20 million paid mailboxes”