possible reason: http://forums.techarena.in/vista-help/654760.htm

if the OPTIONS request to the root of the site doesn't succeed or
returns but doesn't say that the server can talk DAV (Basically support verbs
like PROPFIND, PROPPATCH etc), WebDAV redirector will not be able to connect
to such a server.

An option/workaround is to actually have the root of the site support
OPTIONS request.

WebFolders gets installed on Vista if Office System 2003 is installed on
Vista. Besides that, there is no way of installing WebFolders on Vista.

Thanks & I apologize for the inconvenience.

I've tried several webdav clients:

• standard windows approach with mounting new network drive -> error 0x80070043
• command line: f.e. net use x: "http://localhost:8080/magnoliaAuthor/.webdav/resources" /User:superuser superuser (and several variants) -> 67 system error (btw default http port 80 was also tried as this is the fixed port to use webdav on XP)
• WebDrive client
• Total commander plug-in

That behavior should be the same also on other Windows OS versions.
To use so called webFolder on Vista you have to install KB-907306 update.

btw when you run the server on Windows, you are able to mount remotely from Linux.