http://www.zimbra.comada sesapa test?
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Key benefits of the Zimbra Server:
* Fast, easy install - all dependent components are packaged together in one simple installer
* Proven open source - built with Linux, Apache Tomcat, Postfix, MySQL, OpenLDAP, Lucene
* Uses industry standard open protocols - SMTP, LMTP, SOAP, XML, IMAP, POP, iCal, CalDAV
* Efficiency and horizontal scalability - Zimbra server is 3-5x faster than comparable systems, plus each server has its own data store, message store, and set mailbox accounts. To scale simply add more servers.
* Software as a Service (SaaS) ready - Multi-tenancy, delegated admin, runs on commodity hardware
* Easy to administer and maintain - familiar open source components, robust migration tools, key feature advantages like real-time backup and restore; intuitive Ajax-based web Admin Console
License
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* The Zimbra Public End-user License Agreement (EULA)
* Yahoo Public License (YPL)
* Zimbra Contribution Agreement