Which add on do you use for ActiveSync support in Thunderbird?

I'm using the inverse SOGo Connector 31.0.1

Does it work, if you type in your sogo credentials for web1p38 user after Thunderbird start?
Do you have multiple accounts added in Thunderbird for the same SOGo server?

I think this is the same issue as this one https://sogo.nu/bugs/view.php?id=3954

it's not the problem with my own dav-account. it's the problem with other connection (see first screenshot) i never set.

and i can't remove this (please see the second screenshot)...

Show your complete liste of installed SOGo packages.

done

I said SOGo packages, not the extensions.

hmm, sorry - where can i find this?

And you obviously installed the SOGo Integrator extension WITHOUT customizing it. Since it asks you for a password on sogo-demo.inverse.ca.

I only know that it worked until a few days ago.

i disabled the Integrator yesterday because i tried out to find the problem.

Well, the problem isn't SOGo. It's your TB profile that is now messed up because you installed the wrong SOGo Integrator extension.

Re-create your TB profile and don't install the SOGo Integrator, unless you have customized it.

Re-create your Thunderbird profile.