When does Zimbra’s Support Life Cycle begin?
Zimbra’s Support Life Cycle begins on the general availability date of the Major Release of the product.
What is the expected compatibility between the server and client components of Zimbra?
Zimbra’s compatibility requirements are to support compatibility across 2 major versions of server and client. However it should be noted that features in newer releases will not be supported with older versions. The intent is to maintain the basic functionality of the oldest version without breaking compatibility. Example, Zimbra Connector for Microsoft Outlook 6.x will work with Zimbra Collaboration Suite server 7.x.