[Update] EssentialPIM Mail 26.0.6

"EssentialPIM includes a calendar/scheduler, todo list, contact manager, basic e-mail client, and tree-like multi-level notes tool that supports rich text, formatting and images.

While many advanced functions such as synchronization and encryption are exclusive in the Pro version, the program is capable of manually importing from a variety of formats including Outlook, TreePad, Google calendar etc.
Additionally, it can export to many formats including HTML, vCard, iCal, RTF, CSV, iPod, text etc."

https://www.portablefreeware.com/index.php?id=98

"The EPIM installer includes both desktop and portable versions.
During setup, you can choose to install EPIM on your system or run it as a portable app from a USB drive."
https://www.epim.com/download-free

Home Page
https://www.epim.com/

What's New
https://www.epim.com/blog-and-news/news/epim-mail-and-epim-pro-26-0-6-released

Version History
https://www.epim.com/blog-and-news/version-history

Editions Comparison
https://www.epim.com/features/explore-epim/mail-vs-pro