InterHmai, thanks, I found this fix elsewhere on the net and tried it. No luck. This UID bug is evidently a problem of long-standing.
Apple is aware of it:
http://support.apple.com/kb/TA23804?viewlocale=en_US.
I tried this method to change UID and set permissions:
http://www.inteller.net/notes/change-user-id-on-snow-leopard
I've had intermittent permissions issues for years on OSX Server with users saving Word docs to the server. I always thought the problem was with Apple, but (no surprise) it seems to be Microsoft's bug.
In any event, I DID find a fix, though. Essentially what is happening is that Office 2011 has a bug that disallows the word "file" anywhere in the path of Word documents saved on the server.
See the top of this article:
http://word.mvps.org/mac/cantsavetoserver.html
In my case, the group folder was within a folder called "fileserver". I changed the name to "server" and the file/network permission error disappeared. (Thank you, Microsoft, for allowing me the opportunity to beta test your software.)
The UID fix may, however, be necessary to implement sooner or later. I found that with Office 2008, permissions would go wonky over time, likely because of the UID issue you describe. The same may be true for Office 2011, but for the moment changing the pathname eliminated the error.
