Office 2007 on Windows Vista prompts for user credentials when opening documents in a SharePoint 2007 site

If you run Office 2007 on Vista you might have the annoying problem that Office alway's prompts for a login when opening a document from a SharePoint site even when you are already logged on.
 
This is a known issue and there is a hotfix available for this problem. This hotfix is included in Windows Vista Service Pack 1. However, you must still configure the AuthForwardServerList registry entry.

This is what you have to do:

1. Click Start, type regedit in the Start Search box, and then press ENTER.
2. Locate and then click the following registry subkey:
3. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
4. On the Edit menu, point to New, and then click Multi-String Value.
5. Type AuthForwardServerList, and then press ENTER.
6. On the Edit menu, click Modify.
7. In the Value date box, type the URL of the server that hosts the Web share (one URL per line), and then click OK.
8. Exit Registry Editor.
9. Restart the WebClient service 

• https://*.mavention.nl
• http://*.www.mavention.nl
• *.mavention.nl
• https://127.0.0.1