I am currently evaluating Zimbra Collaborative Suite - Open Source Edition and so far I've really liked what I've seen. The evaluation is a part of a study I'm doing as my final thesis in my education.
My main concern relates to a long-term solution and to acquire this vendor lock-in has to be avoided. Therefor I'm looking into the possibility to export all of the users' data (account, mail, calendars, etc.) to open formats.
How does Zimbra respond to this kind of demand?