We're trying to let Office on Vista interoperate with our Subversion server via WebDAV. We've made some progress and identified some of the 'problems' in the WebDAV clients inside Vista, which are being reported to http://greenbytes.de/tech/webdav/webdav-redirector-list.html However, we have a Vista Business SP1 desktop which appears to be different. It has mrxdav.sys 6.0.6001.18000, yet it doesn't appear to be used: 1 85.1.1.1 - - [13/Jun/2009:00:13:08 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft Office Protocol Discovery" 2 85.1.1.1 - user [13/Jun/2009:00:13:14 +0100] "OPTIONS / HTTP/1.1" 200 - "-" "Microsoft Office Protocol Discovery" 3 85.1.1.1 - user [13/Jun/2009:00:13:15 +0100] "HEAD /my%20document.docx HTTP/1.1" 200 - "-" "Microsoft Office Existence Discovery" 4 85.1.1.1 - user [13/Jun/2009:00:13:16 +0100] "GET /my%20document.docx HTTP/1.1" 200 69766 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.0.04506; InfoPath.2; .NET CLR 1.1.4322; .NET CLR 3.5.21022; MS-RTC LM 8; MSOffice 12)" 5 85.1.1.1 - user [13/Jun/2009:00:13:17 +0100] "HEAD /my%20document.docx HTTP/1.1" 200 - "-" "Microsoft Office Existence Discovery" I'd expect to see User-Agent Microsoft-WebDAV-MiniRedir/6.0.6001 and some PROPFIND requests; finally ideally followed by a LOCK. Instead, Office(?) opens the document read-only. We've tried removing any registry entries from HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Common\Internet\Server Cache How do we determine what is wrong with this Vista installation? We're using Basic authentication with SSL. I've read http://support.microsoft.com/default.aspx/kb/838028/ but other Vista/Office 2009 installations appear to do this differently, using the WebDAV Mini-Redirector (MRXDAV.SYS) so I believe that document should not be valid for Vista. Many thanks, Nick

It appears this was because the SSL certificate presented by the server was not trusted. I don't spot in the 'working' logs the same initial OPTIONS / by the Microsoft Office Protocol Discovery, but presumably I must have just missed it. Now the certificate is imported to the Trust Root Certification Authorities store, Office will open the document read/write via WebDAV; although the results are quite messy and the username dialog is presented many times: 1.1.1.1 - - [22/Jun/2009:01:54:19 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:19 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:19 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:20 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:20 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:21 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:23 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:54:23 +0100] "OPTIONS / HTTP/1.1" 200 - "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:54:24 +0100] "PROPFIND /test.txt HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:54:24 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:54:24 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:54:29 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:54:29 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:58:54 +0100] "OPTIONS / HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:54 +0100] "OPTIONS / HTTP/1.1" 200 - "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:58:55 +0100] "PROPFIND /test.txt HTTP/1.1" 401 493 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:55 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:55 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:56 +0100] "PROPFIND / HTTP/1.1" 207 833 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:56 +0100] "PROPFIND / HTTP/1.1" 207 833 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:56 +0100] "PROPFIND /test.txt HTTP/1.1" 207 879 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:57 +0100] "LOCK /test.txt HTTP/1.1" 200 443 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:58:57 +0100] "GET /test.txt HTTP/1.1" 200 32 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:58:58 +0100] "HEAD /test.txt HTTP/1.1" 401 - "-" "Microsoft Office Existence Discovery" 1.1.1.1 - - [22/Jun/2009:01:59:48 +0100] "HEAD /test.txt HTTP/1.1" 401 - "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:59:48 +0100] "HEAD /test.txt HTTP/1.1" 200 - "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:59:48 +0100] "PUT /test.txt HTTP/1.1" 204 - "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - u [22/Jun/2009:01:59:50 +0100] "PROPPATCH /test.txt HTTP/1.1" 207 392 "-" "Microsoft-WebDAV-MiniRedir/6.0.6001" 1.1.1.1 - - [22/Jun/2009:01:59:52 +0100] "HEAD /test.txt HTTP/1.1" 401 - "-" "Microsoft Office Existence Discovery" 1.1.1.1 - u [22/Jun/2009:01:59:56 +0100] "HEAD /test.txt HTTP/1.1" 200 - "-" "Microsoft Office Existence Discovery"