I administer a mixed PC / Mac network. When one of my Macintosh-using clients* opens a file within a folder on my Windows 2008 R2 server, that folder is locked and other clients are unable to open that folder. This problem did not show up on any systems prior to my binding the Macs to the Active Directory. Any tips? * Clients are running 10.8 on a fleet of aging Mac Pros. ** My apologies if this should have gone in the 10.8 forum. Wasn't sure.