I think in light of basic auth, digest auth looks more like fort knox. So it seems only logical to prefer digest auth over basic auth whenever possible. InfCloud claims that it is not compatible, but I haven't seen any instance of such an incompatibility. The documentation also lacks pointers to said incompatibilities. My hypothesis is that such incompatibilities do not exist. In fact, I'm using (admittedly an older version of) CalDAVMate successfully with Firefox and Baikal configured to do digest auth. For now, it seems to me that digest auth is advised against without any substantiation. I would like to understand why basic auth is preferred over digest auth.