The best Contact Manager alternative to Microsoft Outlook is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Microsoft Outlook and nine of them are Contact Managers so hopefully you can find a suitable replacement. Other interesting Contact Manager alternatives to Microsoft Outlook are Evolution, EssentialPIM, Kontact and sup.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.
Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook system, and more.
Contacts keeps and organize your contacts information. You can create, edit, delete and link together pieces of information about your contacts. Contacts aggregates the details from all your sources providing a centralized place for managing your contacts.
Savely is an all-in-one personal information management platform designed to streamline and simplify how users handle their data. With an intuitive interface and powerful security features, it consolidates various aspects of daily organization, including:
Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run Koma-Mail from your flash drive but, of course, also on your desktop.
Clyton is an email client with advanced security and spam filtering features. Although priced for the general public, Clyton possesses the reliability and security required by businesses.
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Despite its age, Thunderbird remains the most fully featured email client out there. Various add-ons can extend its functionality, it (now) has a built in calendar and, unlike Outlook, it's free, open source and respects your privacy.