Windows NT access

[cruella]

We have a Red Hat 6.0 file server and a Windows NT application server. We use Windows NT 4.0 workstations. I am new to Linux. I created a Directory for our Marketing Dept called "Marketing" and a user group called "Market" for all employees of that dept. The directory permissions are (drwxrwx--- root Market), which looks right to me. When the users try to modify anything in that directory, they get an Windows error, which basically says they do not have "write or delete" access to that directory. When I look at the permissions for that directory in Windows, it says "Special Access". I don't know what I am missing, I have checked the groups, permissions, etc. Any help would be appreciated.