Kontact Alternatives for Windows

Microsoft Outlook is a personal information manager from Microsoft.

eM Client is a Windows based e-mail client for sending and receiving e-mails, managing calendars, contacts, and tasks.

Postbox is powerful, intuitive, ultra-customizable, speedy task manager.

Rainlendar is a calendar program for Windows, Mac OS X and Linux.

MyLifeOrganized (MLO) is the most flexible and powerful task management software for getting your to-dos finally done.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, etc.

The Bat! is an email program for Windows that protects the correspondence and empowers the users to handle large amounts of emails quickly and efficiently.

Sylpheed is an open-source e-mail client and news client licensed under the GPL.

Mutt is a text-based email client for Unix-like systems.

Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.

OpenProject is a web-based project management system for location-independent team collaboration.

Memotoo sync all your contacts from Gmail, Facebook, phone, Thunderbird, Outlook, etc in a single address book.

Microsoft Mail and Calendar apps help you stay up to date on your email, manage your schedule and stay in touch with people you care about the most.

FCorp ID Book is a portable, light but powerful address book.