What are the renewal or on-going costs for the Zimbra software?

Zimbra is licensed either on an yearly subscription (1, 2 or 3 years options available) or a perpetual license with annual support. The cost for renewing the yearly subscription is the same as the initial subscription cost. There is no renewal for a perpetual license, instead you can choose to renew the annual support to continue to access Zimbra support and newer versions of Zimbra software.