CalDAV:
I only ever got groupdav running once, every other machine I use lures me into using CalDAV.
Speaking of this, I can offer a Sailfish OS mobile phone and a bunch of Apple devices to torture your CalDAV implementation. Just tell me where and when and why and what.
Floors:
IIRC, IMAP supports folders inside folders. Isn't it purely semantics? Couldn't we just call a folder that is a "leaf" a room and everything else a Floor? That would make the INBOX a floor.
It would then only be a thing to display them in the Rooms "room". I guess I am missing a point here...
