It's really hard to believe. What started out as a humble Exchange competitor is really beginning to become a serious power player in the world of online collaboration.
Indeed, no company is immune to the current economic trouble, but I think this milestone really shows how much momentum Zimbra has behind it.
Many of you are responsible for this, and there's no way we could have made it without you.
(By the way this doesn't include Open Source Edition mailboxes)
Zimbra Hits 20+ Million Paid Mailboxes
-The Zimbra Team
Bugzilla
Wiki
Source
Big Milestone 
Linear Mode
