The Modern Web App delivers a responsive experience across all your devices and integrates with many popular apps.
The Classic Web App is familiar to long-time Zimbra users. It delivers advanced collaboration and calendar features popular with power users on Desktop web browsers.
This will sign you in according to your saved Preference. In the Modern Web App, set this preference in Settings > General > Zimbra Version. In Classic, set it in Preferences > General > Sign In.
Note that your web browser or display does not fully support the Advanced version. We strongly recommend that you use the Standard client.