Hi Karsten,
I do not think it is a Vista issue because if I install Microsoft Office
2003 on the vista test machine the file are opened in
read write mode.
I think that the problem is within Microsoft Office 2007 and not in Vista.
It seems like this problem is faced by many webdav implementations (googling
for office+2007+webdav+readonly returns many positive hits). Anyway, I'm
unable look into this issue seriously at the moment because I don't have a
Vista box. Btw, did you go through
http://blogs.msdn.com/sharepoint/archive/2007/10/19/known-issue-office-2007…
**It seems to have a potential solution under "How to place Office 2007
applications into Windows XP SP2 compatibility mode".
Btw, on which port are you executing xwiki server? I think for windows
clients it MUST to be on port 80. But since you got it to work with office
2003, i beleive you are already running the server at port 80 :)
If I can be of further help just let me know.
You have already helped us! and it's really appreciated :)
Thanks.
- Asiri