I am new to Alfresco, so I might be missing some of the subtleties, but I have an installation of Enterprise - v3.0.0 (r11498)running with NTLM SSO enabled as per http://wiki.alfresco.com/wiki/3.0_Configuring_NTLM. NTLM auth and SSO is working well for the primary Alfresco web client and for Share. I believe that it's working for WebDav as well, as I can download a document from the "View in WebDav" link, and I can browse http://myservername:8080/alfresco/webdav/ OK.
I have not yet tried to setup CIFS / NTLM authentication - it looks like that's a bit more complex, and I am leaving it for later.
However, when I installed the latest (I think) office plugins - alfresco-labs-office2003-addins-3a.1032.zip - and installed, I am unable to authenticate. I have entered in the correct web client and webdav URLs, but I just get the "couldn't authenticate with the Alfresco server" dialog box.
Any updates on the current status of NTLM and Office plugin integration? I would think this would be a very common setup / request in the corporate environment.
EDIT - it looks like I actually am able to browse the CMS and apply tags, etc. from the Office plug-in, so it is sort of working. I still occasionally get the logon box and failure notice, but it doesn't seem to stop me from working with the docs. Is this a known issue?