Windows email clients

free and open source email client and personal information manager

email service developed part of Microsoft 365

web browser with built-in email client

Microsoft e-mail client software

rapid application development platform

email client, electronic calendar and newreader, developed by Microsoft

defunct email client

email and newsgroups client

email client

e-mail client

Sylpheed is an open-source e-mail client and news client licensed under GNU GPL-2.0-or-later with the library part LibSylph under GNU LGPL-2.1-or-later. It provides easy configuration and an abundance of features. It stores mail in the MH Message Handling System. Sylpheed runs on Unix-like systems such as Linux or BSD, and it is also usable on Windows. It uses GTK+.

GroupWise is a messaging and collaboration platform from OpenText that supports email, calendaring, personal information management, instant messaging, and document management. The GroupWise platform consists of desktop client software, which is available for Windows, (formerly Mac OS X, and Linux), and the server software, which is supported on Windows Server and Linux.

Foxmail is a freeware e-mail client developed by Tencent.

Becky! Internet Mail is an e-mail client software for Microsoft Windows developed by the Japanese company RimArts from Matsudo, Chiba. Becky! was originally released in 1996 as Becky! Version 1. That version was rewritten in the early 2000s and Becky! Version 2 was released in 2004 and is still the flagship product, receiving periodic updates.

proprietary email system released for Novell Netware local area network

conflation of two applications developed by Microsoft