šŸ¤” Under consideration: MMD Fork of DAVx5

I don’t have experience with Mailfence or Mudita Center, but perhaps this will help:

When my household had…

  • DAVx5 and Etar (in place of MuditaOS K’s Calendar) on a Kompakt (sold, but planning to buy again @ v1.6.0),
  • DAVx5 on a Google Android cellphone,
  • Thunderbird on a Windows 11 PC, and
  • Thunderbird on an Ubuntu PC,

..we were able to edit our household’s TheGood.Cloud-hosted contacts on any of…

  • Etar on the Kompakt,
  • Calendar on the Google Android cellphone,
  • Thunderbird on the Windows 11 PC, or
  • Thunderbird on the Ubuntu PC,

…and we were able to edit our household’s TheGood.Cloud-hosted calendar on any of…

  • Contacts on the Kompakt,
  • Contacts on the Google Android cellphone,
  • Thunderbird on the Windows 11 PC, or
  • Thunderbird on the Ubuntu PC.

…and have those calendar and contacts edits appear on all four devices in our household (Kompakt + Google Android cellphone + Windows 11 PC + Ubuntu PC) because any such edit got synchronized back to our TheGood.Cloud account (which then got synchronized to all four devices).

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