WebDAV configuration problem on windows 2008

Hi,

We installed windows 2008 server, IIS7 and the additional download to enable WebDAV.
Everything is working fine, except saving document on a Web Folder or create a new subfolder in there. This is as wel on Vista and on XP client PC's.

I cannot find a good setup guide for this or more information on how to fix this.

Additiontal information:
- We use Integraded pools
- .NET is installed but disabled on the pools (No Managed Code)
- Anonymous Authentication is disabled, Windows Authentication Enabled
- Authorization is set to: Allow / All Users / Inherited
- WebDAV Authoring Rules: * / x@yyyy.com / Read-Write-Source / Local

Suggestions?

Hans