Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool. Developed by Zimbra
License: Free Personal
Zimbra Desktop is an open-source email client that offers offline access and integration with various services, while Windows Live Mail, though user-friendly, is no longer actively developed and may struggle with non-Microsoft accounts. Users looking for a customizable and open-source solution may prefer Zimbra, whereas those who prioritize ease of use with Microsoft services might lean towards Windows Live Mail.