Our small firm of 7 employees is looking at alternatives to Exchange and I just came across Zimbra. I see lots of posts on the net about how its absolutely free but this website has a "Buy Zimbra" button that leads to not-so-free installs. I'm guessing there are free licenses and paid licenses and that the paid ones add support and potentially additional features. Can someone clue me in on the difference between paid vs. free or perhaps point me to a link that would? We're currently using Outlook and our iPhones and Android phones to view our mail. Our Zimbra install would need to do likewise, though we might be able to ditch Outlook if it meant the difference between a free and paid install. We couldn't forgo the smartphones, though. Any advice would be greatly appreciated.