Hello,

I'm the developer of TbSync, an ActiveSync AddOn for Thunderbird:
TbSync
https://addons.mozilla.org/de/thunderbird/addon/tbsync/
TbSync ist eine zentrale Benutzeroberfl?che zur Verwaltung von Cloud-Konten und zur Synchronisierung ihrer Kontakt-, Aufgaben- und Kalenderinformationen mit Thunderbird.


The latest version is available directly at my GitHub release page (Mozilla always takes a while to review new versions):
Releases ? jobisoft/TbSync
https://github.com/jobisoft/TbSync/releases
[Thunderbird Add-On] Central user interface to manage cloud accounts and to synchronize their contact, task and calendar information with Thunderbird - jobisoft/TbSync


The AddOn works with a large number of servers and services:
Home
https://github.com/jobisoft/TbSync/wiki/What-is-TbSync%3F#compatibility-list
[Thunderbird Add-On] Central user interface to manage cloud accounts and to synchronize their contact, task and calendar information with Thunderbird - jobisoft/TbSync


However, I was not yet able to test it with OX. I do not have the resources to set up my own OX server, so I am looking here for users, who are interested and willing to test!

Feedback is appreciated.

Best regards,
John