Groupoffice (currently 6.2) webdav has been working solidly for the last four years, but unfortunately the latest update of Windows 10 (10 May 2019) has broken it for me.
From what I can tell, it is a quota or permissions issue whereby a PROPFIND request is returning 0 bytes for the quota, or possibly the Microsoft client (WebDAV MiniRedir) is not able to access the appropriate property as it seems that PROPFIND returns 401.
Is webdav still actively supported within GroupOffice, and if so is it worth migrating to 6.4?
I have tried searching for a similar report on the SabreDAV forum, but it seems that the forum is no longer active. I do see that there is activity of the Github page, but no mention of this problem.
I really like the tight integration within GroupOffice and would prefer to use the files / webdav module over any other cloud service.