If you have been syncing Notebooks to your own WebDAV server on a Mac running Mac OS 10.7, you probably notice that this WebDAV setup no longer works on Mac OS 10.8 (Mountain Lion). Here are two hints.
Mac OS X Server
In MacOS 10.7 OSX Server (Lion), the WebDAV service published user sharepoints in the form
https://www.example.com/webdav/user
With Mac OSX Server 10.8, that sharepoint path is still accessible but does not work properly with respect to a number of WebDAV HTTP actions. However, the users’ WebDAV sharepoints can be accessed as
https://www.example.com/user
(i.e., omitting the “/webdav” portion of the path). This works properly with Notebooks, the Finder, and other WebDAV clients.
(Thanks to Brian Adamson for these details.)
Mac OS X (non server)
Setting up a WebDAV server on Mac OS X is a little more complex, but not really complicated either. Here are a few resources
https://reviews.cnet.com/8301-13727_7-57481978-263/how-to-enable-web-sharing-in-os-x-mountain-lion/
https://manas.tungare.name/blog/howto-setup-webdav-on-mac-os-x/