Good point there; at the end of the day one has to pretty much roll with whatever Microsoft does, even if something they change breaks a bunch of things. I think that is a pretty sorry state of affairs, but I believe you have characterized it accurately.
Or they don't, anymore than they develop(ed) workarounds for some of the problematic FrontPage extensions. DH is a Debian shop, not a MS shop, though I agree that it is probably in their best interests to facilitate MS products whenever possible/practical
I agree with you whole-heartedly on that. I mean, if it doesn't work at present, people need to be told that up-front, so they can plan accordingly for meeting their needs. Having a WebDAV setup in the Control panel that doesn't work with MS's newest OS is a big deal, and needs to be addressed one way or another - it shouldn't just be ignored.