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I think rouncube is a great option too (http://roundcube.net/)

atMail is really great for a simple and intituive IMAP web based mail. I have used roundcube and atMail, both are great, probably atMail is more stable because roundcube is in beta testing, thought i have never seen an open version of atMail. Does anybody knows if it is from the same people that made the paid atMail? (atmail.com)…. i had to use roundcube for the web site of my faculty (www.fstuisek.org) because the commercial version of atMail you have to purchase and our site is non-profit. Anyway i will install it and test it, hope there is no security issues

It looks pretty fine…
But we really have other greener options like Taroby, which is a saas application, and could be accessed from anywhere across the globe with the help of a browser and internet connection. Taroby works with a “unique and green concept” of a “team inbox” allowing sharing of e-mail accounts among the members of the team.

We have been using AtMail for almost 5 years now. We pay for support. However, support from AtMail is non-existent. We have been trying for months now to get AtMail to deal with some issues and they have not dealt with them. They respond, but do not actually do anything. Functionality claims are not always supported.

As email is very important and downtime cannot be tolerated, we are now switching to Zimbra. I must say, a much better product. Slightly more expensive, but well worth it! There pricing model is very flexible allowing for different types of users.

It is also a true MS Exchange replacement with full mobile syncronization support. No BES server required for Blackberries.

There support has been very good. Anyone considering a collaboration suite should have a look at this.

Beware of AtMail promises.