hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
PowerMTA - PowerMTA is an industrial-strength software for high-volume email delivery.
SoftMaker Office - SoftMaker Office is one of the most powerful and reliable office suite that is fully compatible with the MS Office Suite.