Zimbra

Zimbra is a collaborative software suite that includes both an email server and a web client. Originally developed by Zimbra, Inc., it is now owned by Synacor. The platform is popular for its open-source architecture and the integration of several communication tools into one interface, making it a comprehensive solution for enterprise-level communication and collaboration needs.

### Key Features of Zimbra:

1. **Email**: Zimbra provides a robust email service that supports all standard protocols (IMAP, SMTP, POP3). It includes features like email forwarding, filters, auto-responding, and tagging.

2. **Calendar**: Integrated calendaring allows users to schedule and manage appointments, meetings, and events with ease. It supports sharing calendars among users, public and private entries, and integration with third-party calendar services.

3. **Contacts Management**: Users can maintain a detailed contacts list that can be shared and synchronized across devices.

4. **Tasks and Briefcase**: Task management tools help users track their to-dos and deadlines. The Briefcase feature allows users to store and share documents in a centralized location.

5. **Instant Messaging**: Zimbra includes an instant messaging feature for quick communication between users, enhancing the collaborative experience.

6. **Integration Capabilities**: It offers integration with various third-party applications, enhancing its functionality and adaptability to different business environments.

7. **Web Client**: A powerful web client interface that supports most browsers, providing users with access to their email, calendar, contacts, and other tools from anywhere.

8. **Security Features**: Zimbra includes comprehensive security measures such as end-to-end encryption, anti-spam filters, and antivirus protection.

9. **Mobile Support**: Supports mobile devices through standard synchronization protocols, allowing users to access their mail, contacts, and calendar on the go.

10. **Administration Tools**: Zimbra provides a suite of administrative tools for managing the server, monitoring performance, and ensuring compliance with security policies.

Zimbra is favored by organizations looking for a reliable, scalable, and feature-rich platform for managing their communications and collaborative tasks. It is available in both open-source and commercial versions, catering to a variety of business needs and sizes.