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 KMail and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to KMail are Betterbird, Microsoft Outlook, eM Client and Mailspring.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Betterbird, a soft fork of Mozilla Thunderbird, improves user experience with advanced features, bug fixes, security patches, and multi-row descriptions similar to Outlook. Compatible with multiple platforms and can be used alongside Thunderbird, sharing the same profile.
Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.
eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts, notes and chat.
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.
Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.
A secure, cross-platform email client with a unified inbox, built-in PGP encryption, and optional AI. Use powerful AI when you want it or turn it off completely. Your email, your control.
The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
Modern open-source email client supporting unified inbox, IMAP/SMTP, Gmail and Outlook with OAuth2, conversation threading, rich text TipTap composing, CardDAV contact sync, tracking removal, dark mode, color themes, vim-style shortcuts, and a detachable window.
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
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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