Thanks!
Ok now I have an even stranger question related that is sure to make you cringe. We are using Client for NFS in 2008 R2 with IIS 7.5, with the files hosted on a Linux NFS server (actually a NFS share on a NetApp SAN in production, but a Linux NFS server in our dev environment).
We are using an active directory server with the Identity Mapping for UNIX service. Each separate site runs as a unique user that has a unique userid/groupid set. IIS servers the files correctly, i.e. if a site runs as user123 IIS will only serve the files user123 has access to.
The problem is the actual IIS log files are getting written as the nfsnobody anonymous user, for all sites, which causes problems when we want to let user123 log into a FTP server as user123 and download their log files.
So in short what seems to be the problem is IIS 7.5 in 2008 R2 does not write the log files as the same user that the site is running as when the logs are on a NFS share... There doesn't seem to be any way to configure what user IIS writes the log files as.