What somehow bothers me is that the new protocol is all-in-one. Instead of building on &#x2F; integrating with CalDAV &#x2F; CardDAV and being modular, they are rolling everything in the same protocol. This is possibly convenient for a protocol controlled by one commercial entity, but why not just use Outlook&#x27;s then?<p>Piggybacking it over HTTP also looks a bit strange, but probably helps corporate firewall penetration.