Zimbra is a software brand focused on open source server and client solutions for messaging and collaboration. Its offerings include the Zimbra Web Client, where users can sign in to access the web app and choose an experience suited to their preferences and devices. The Modern Web App provides a responsive interface across devices and integrates with many popular apps.

The Classic Web App offers a familiar interface for long-time Zimbra users, with advanced collaboration and calendar features aimed at power users using desktop web browsers. A Default option signs users in according to their saved preference, and the selected version can be managed through the app’s settings or preferences. The sign-in page also provides controls for entering a username and password, showing or hiding the password, and choosing whether to stay signed in.

Zimbra’s combination of server and client software supports messaging alongside collaborative and calendar-based workflows. The brand name is a registered trademark of Synacor, Inc., which holds the stated copyright for the web client