Zimbra provides open source server and client software for messaging and collaboration. Its web client gives users access to a sign-in experience with options designed to suit different devices and working preferences. The Modern Web App offers a responsive experience across devices and integrates with many popular apps.

The Classic Web App is intended for long-time Zimbra users and provides advanced collaboration and calendar features valued by power users on desktop web browsers. Users can choose Modern or Classic, or select Default to sign in according to their saved preference. Version preferences can be managed in the settings of either app.

The sign-in page also includes username and password fields, a show-or-hide password option, and a “Stay signed in” choice. Zimbra is identified as a registered trademark of Synacor, Inc., which holds the copyright notice shown on the page. Through its server and client software and web app experiences, Zimbra focuses on supporting messaging, collaboration, and calendar use