Is Zimbra completely production ready today? I am a little confused by the fact that the open source version still lists everything as Beta. Does the "beta" relate only to feature completeness or does it relate to bug fixes and general stability also. Is Zimbra stable enough to move approximately 200 user onto it today or do we need to wait for a few more months?
In general it depends on you and your users. There are still bugs but Zimbra is in production in many organizations much bigger than yours today.