Annual subscription licenses renew every year based on the day of purchase. One, two and three-year subscription terms are available and there is a discount for multi-year subscriptions. For the duration of the subscription, customers are entitled to major and minor release updates and Zimbra Advantage or Premium Support, portal access and more. Customers who do not renew their annual subscription will lose the right to use the software. This differs from a perpetual license that entitles customers to permanent use of the software.
Perpetual is a permanent software license for the major release version you are buying. There are no rights to any updates, upgrades or extensions or enhancements to the Software developed by Zimbra unless you separately purchase Zimbra support or subscription services. Zimbra Support for Zimbra is purchased either annually or as a three-year term in addition to the license cost (with first year mandatory) and entitles you to major and minor release updates, portal access and more. Perpetual licenses offer the most cost-effective licensing model for a multi-year deployment.