Open Source Alternatives to Microsoft 365

SOGo is a fully supported and trusted groupware server, designed for businesses and communities to seamlessly share calendars, address books, and emails. Released under the GNU GPL/LGPL v2 and above, SOGo focuses on scalability and open standards, providing a rich AJAX-based web interface and supporting multiple native clients through standard protocols like CalDAV, CardDAV, GroupDAV, and Microsoft ActiveSync.

• Scalable Groupware: SOGo is designed to handle thousands of users, making it suitable for large production environments.
• Rich Web Interface: The AJAX-based interface offers a user-friendly experience for accessing emails, calendars, and contacts.
• Standard Protocols: Supports CalDAV, CardDAV, GroupDAV, and Microsoft ActiveSync for seamless integration with various clients.
• Microsoft Outlook Compatibility: Offers native support for Microsoft ActiveSync and compatibility with Outlook through the Outlook CalDav Synchronizer.
• Mobile Device Synchronization: Fully synchronizes emails, contacts, events, and tasks with mobile devices like Apple iPhone, Android, and Windows Phone.
• Resource Sharing: Allows for easy sharing of calendars, address books, and emails within an organization.
• Permission Handling: Provides robust permission management to control access to shared resources.

SOGo is the missing component in your infrastructure, offering a uniform and complete interface for users to access their information. Its deployment in environments with thousands of users attests to its reliability and scalability.