API Is there an API (application programming interface) available? Yes, almost all of Zimbra is exposed via SOAP and REST URL’s. We suggest you start by reviewing the following articles: https://wiki.zimbra.com/wiki/Zimbra_REST_API_Reference https://wiki.zimbra.com/wiki/SOAP_API_Reference_Material_Beginning_with_ZCS_8 https://wiki.zimbra.com/wiki/Zimlet_Developers_Guide:Zimbra_JavaScript_API_Reference