Thunderbird
Open Source
Thunderbird is a open source mail client developed and maintained by Mozilla foundation.
Postbox
Commercial
Postbox is powerful, intuitive, ultra-customizable, speedy task manager.
Airmail
Commercial
Airmail is a fast mail client for Mac and iPhone.
Mutt
Open Source
Mutt is a text-based email client for Unix-like systems.
Kontact - KMail
Open Source
KMail is the email component of Kontact, the integrated personal information manager from KDE.
Spark
Free
Spark is a fast, smart mail manager app.
MailMate
Commercial
MailMate is an IMAP email client for macOS featuring extensive keyboard control, Markdown integrated email composition, advanced search conditions.
Apple Mail
Free
Apple Mail is an email client included with the operating systems macOS, iOS and watchOS by Apple Inc.
Apple Calendar
Free
Calendar is a personal calendar application made by Apple Inc. that runs on both the macOS desktop operating system and iOS mobile operating system.
Sylpheed
Open Source
Sylpheed is an open-source e-mail client and news client licensed under the GPL.
Zimbra Desktop
Free Personal
Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool.
Open365
Open Source
Open365 is an all-in-one productivity suite, based on KDE, Seafile, LibreOffice, Docker, and Jitsi.
Polymail
Freemium
Polymail is an email application for OS X and iOS known for its clean interface and additional features atop the Gmail platform.
BusyCal
Commercial
BusyCal is a calendar app for mac.
Compare Microsoft Office Outlook with alternatives
Compare Thunderbird and Microsoft Office Outlook and decide which is most suitable for you.
Compare Apple Mail and Microsoft Office Outlook and decide which is most suitable for you.
Compare Postbox and Microsoft Office Outlook and decide which is most suitable for you.
Compare Apple Calendar and Microsoft Office Outlook and decide which is most suitable for you.
Compare Airmail and Microsoft Office Outlook and decide which is most suitable for you.
Compare Sylpheed and Microsoft Office Outlook and decide which is most suitable for you.
Compare Mutt and Microsoft Office Outlook and decide which is most suitable for you.
Compare Zimbra Desktop and Microsoft Office Outlook and decide which is most suitable for you.
Compare Kontact - KMail and Microsoft Office Outlook and decide which is most suitable for you.
Compare Open365 and Microsoft Office Outlook and decide which is most suitable for you.
Compare Spark and Microsoft Office Outlook and decide which is most suitable for you.
Compare Polymail and Microsoft Office Outlook and decide which is most suitable for you.
Compare MailMate and Microsoft Office Outlook and decide which is most suitable for you.
Compare BusyCal and Microsoft Office Outlook and decide which is most suitable for you.