HTTP digest authentication for webdav and Office 2010 upload center

[LuSterZ]

I have a web application that has a WebDav share for Word that uses http digest authentication. We use javascript like the following to open word documents on the in word:\[code\]Doc = new ActiveXObject("Sharepoint.OpenDocuments.3");Doc.EditDocument(url, 'Word.Document');\[/code\]In office 2003 and office 2007, it works (but not 100% reliably). In Office 2010, I can open the document fine, but when I save a document, it comes up in Microsoft Office Upload Center, with the error "Upload Failed - Upload error". There is a drop down menu button offering to resolve the problem, but none of the options are useful in diagnosis.Looking at the logs on the server, it got as far as making a LOCK request.We are using a slightly customised version of HTTP_WebDAV_Server from PEAR. Will we need to switch to a more advanced authentication for this to work? Can that be done from a PHP based WebDav server?