…Zimbra paid mailboxes - 41 million and counting.
Crossing the 40 million mark is a big milestone and the credit lies with the growing Zimbra Community (more than 20,000 members strong) and our customers who have helped spread the word. And our 40M paid mailboxes doesn’t even include Zimbra’s millions of open source users.
…Today the majority of our new prospects (68%) are coming from Latin America, Asia and EMEA (Europe, Middle East, Africa).

[Read full article at Zimbra Blog]
…The secret to Zimbra’s success? Innovation and integration, in part. While Google Maps has found its way into a range of different applications, Zimbra leads Gmail in mash-ups (called “Zimlets” in Zimbra parlance). My company is a Zimbra customer, and one of our sales engineers wrote a Zimlet to integrate Alfresco with Zimbra…in his spare time…over a weekend.
Yes, Zimbra is that easy to extend. [Read full article at CNet]
…At any rate, here’s what Zimbra has that makes it an emerging threat to other business productivity suites: first, it has a complete e-mail product set, including a mailbox service and a very strong client–online, offline, and mobile. The relatively new offline client is especially interesting: It uses the Firefox core (called Prism), but you’d never know you were in a browser-based app. Even links in e-mails to Web sites don’t by default go to your Firefox browser; instead, they go the system default. If your PC is set to open up URLs with Internet Explorer, that’s what the Zimbra client will do. [read full article at CNet]