Zimbra is a software brand focused on open-source messaging and collaboration. Its offerings include server and client software, along with the Zimbra Web Client, which provides access to messaging and collaboration tools through a web browser. The web client is available in Modern and Classic versions to suit different user preferences and workflows.

The Modern Web App is designed to provide a responsive experience across devices and integrates with a range of popular apps. The Classic Web App is intended for long-time Zimbra users and offers advanced collaboration and calendar features that are popular with power users on desktop browsers. Users can also choose a default version, allowing the web client to follow their saved preference when they sign in.

Zimbra is a registered trademark of Synacor, Inc., which holds the copyright to the web client. The brand’s stated focus is on providing software that supports messaging, calendar use, and collaboration across its server, client, and web-based offerings.