Kontact - KMail is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Kontact - KMail and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Kontact - KMail are Microsoft Office Outlook (Paid), Mailspring (Freemium, Open Source), eM Client (Freemium) and Claws Mail (Free, Open Source).
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
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Thunderbird vs Kontact - KMail opinions
Almost everyone thinks Thunderbird is a great alternative to Kontact - KMail.
On top of being a very good groupware, Thunderbird allows you to easily select a differnt partition/folder to save all your email to, in real time, without having to creat seemlink (you have to create many seemlink with Kontact/Kmail to achieve the same result) and it's lighter than Kmail/PIM
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability
Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.