KMail is the email component of Kontact, the integrated personal information manager from KDE. Developed by KDE
License: Open Source
Open365 offers a cloud-based, integrated office suite with collaboration tools, making it ideal for users seeking a comprehensive online productivity solution. In contrast, Kontact - KMail provides a customizable and privacy-focused email management experience, better suited for users who prioritize email functionality and integration with the KDE environment.