I hope someone can help us with our next problem:
The Word documents are located on our intranetsite protected with name and password (Single-Sign-On with Active Directory). Our older clients with Windows XP (SP3) and Word 2003 could open these documents without any problem. PDF documents are not affected.
We discovered also that applying the credentials doesn't work and using the "Remember my credentials" option box doesn't work either. Entering the credentials 3 times will give access to the Word document but just clicking on the Close or Cancel button will do the same.
Documents from our SharePoint 2010 site are not affected.
We have searched the internet for a solution for this problem but the hints, tips and solutions found so far do not work for us.
We applied KB article http://support.microsoft.com/kb/943280 but even this one does not workfor us. This article add a new key AuthForwardServerList to the registry with an URL list so the WebClinet can send credentials through these channels
Another solution to add our intranetsite to the trusted sites list in IE8 doesn't work either.
We tried also this one http://www.andornot.com/blog/post/How-to-enable-Windows-7-single-sign-on-for-a-website-using-Windows-authentication.aspx with negative result.
Things discovered so far:
If we disable the WebClient service the problem is gone but in that case we can't access documents from our SharePoint site.
We installed a client with Windows 7 and Office 2003 Pro with the latest service packs and we can direct access the documents in IE8 without any problem. This pintpoints the problem to Office 2010!