I am accessing the built in SharePoint 2010 on SBS2011 via Microsoft Office Excel and Word (opening a file from WebDAV http file mapped drive in Explorer).
When saving a file, I get prompted from within Microsoft Office 2010 Word/Excel for credentials - entering the correct credentials just prompts the window again.
Clicking cancel allows me to go to My computer -> mapped drive and save the file.
I am able to browse the SharePoint site via Internet Explorer without an issue and I am not prompted for a password when doing so, I presume this means Windows authentication is working via the SharePoint URL being in the intranet list.
I have also check that the sharepoint url is in the trusted intranet sites list.
Anything else I should look in to?