Zimbra is a widely used open-source email and collaboration software suite designed for organizations and businesses. It provides email, calendar, contacts, file sharing, and task management features through a web-based interface and supports integration with desktop email clients. Zimbra is known for its flexibility, scalability, and strong security features, making it suitable for both small businesses and large enterprises. It offers both on-premises and cloud deployment options, allowing organizations to control their data and security settings. Zimbra is often targeted by cyber attackers due to its popularity, making regular updates and security patches essential for maintaining system integrity and protecting sensitive information.