Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. Developed by KDE
License: Open Source
Kontact is an open-source application that excels in email management and integrates well with KDE environments, while Microsoft Mail and Calendar offers seamless integration with the Microsoft ecosystem and a user-friendly interface. The choice between the two largely depends on user preference for open-source flexibility versus Microsoft ecosystem integration.