SOGo (Scalable OpenGroupware.org) is an open source collaborative software (groupware) server with a focus on simplicity and scalability. Developed by inverse
License: Open Source
SOGo is an open-source, cost-effective solution that excels in customization and collaboration for small to medium businesses, while Microsoft Exchange Server is a robust, widely-used platform that offers extensive features, security, and integration for large enterprises. The choice between the two largely depends on organizational size, budget, and specific feature requirements.