If it were me right now I'd try BetterBird.  Fork of Thunderbird with oodles of bugs fixed and improvements working well, including easy CardDAV.

https://www.betterbird.eu/

J.E.B.

On 4/16/23 15:26, Sam Kuper wrote:
On Sat, Apr 15, 2023 at 10:45:32PM +0100, Sam Kuper wrote:
Can't currently bring to mind the utilities for converting between
VCard or CSV on the one hand and CardDAV on the other, but I believe
conversion tools do exist.
Some potentially useful utilities:
    
    Virtual Contact File: https://wiki.fileformat.com/email/vcf/
    vdirsyncer: http://vdirsyncer.pimutils.org/
    vdirsyncer manual:
    http://readthedocs.org/projects/vdirsyncer/downloads/pdf/latest/
    vdirsyncer configuration examples:
    https://www.dj-bauer.de/terminal-calendar-with-khal-en.html
    khard: https://github.com/scheibler/khard
    Using khard with Mutt: https://khard.readthedocs.io/en/v0.14.0/
    calcardbackup: https://codeberg.org/BernieO/calcardbackup
    Radicale: https://radicale.org/2.1.html

Source:
https://www.linux-magazine.com/Issues/2020/235/Using-CalDAV-CardDAV-to-manage-calendars-and-address-books/(offset)/6
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Jonathan E. Brickman   jeb@ponderworthy.com    (785)233-9977
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