CalDAV, CardDAV and WebDAV sharing
CalDAV/CardDAV sharing is something we've worked on for quite some time. Our goal is to have out of the box CalDAV sharing working in the next sabre/dav version
It's taking a long time to implement, because we're not just writing the code, we're also writing the standard.
These are the current drafts:
Today I wrote an article on my own blog about how it works and the current status. Read it here.
We'll be at CalConnect 36 in Hong Kong next month to discuss this more. If you're in the area and want to discuss calendaring or sabre/dav, drop us a line!