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Re:Ask HN: Which abandoned proprietary software would you re... by squarefoot on Saturday December 08, 2018 @04:48PM (#18637725)
"High-performance lightweight desktop email clients"

https://www.claws-mail.org/

Don't dismiss it because of the lack of bells and whistles on its web page, it runs circles around everything else. Outlook mail folders also can be imported through an external utility. Runs on Linux, FreeBSD, Windows and reportedly can be built on MacOSX.

Re:Ask HN: Which abandoned proprietary software would you re... by ekianjo on Saturday December 08, 2018 @08:15PM (#18638613)
Evolution is also OK. Not sure how it compared to claws-mail feature wise but they both have a long history.