Claws Mail Alternatives for Windows

Thunderbird is a open source mail client developed and maintained by Mozilla foundation.

Mailbird is a desktop email client for Windows 7, 8 and 10.

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

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.

KMail is the email component of Kontact, the integrated personal information manager from KDE.

Open365 is an all-in-one productivity suite, based on KDE, Seafile, LibreOffice, Docker, and Jitsi.

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.

Foxmail is a freeware e-mail client.