I am trying to deploy Microsoft Office Communicator through Group Policy. After I publish the MSI file, when I try to add it via Control Panel --> A/R P --> Add New Programs, I receive the following error: '1: ALLUSERS property is not 1 - this MSM cannot be used for a per-user or fallback-to-per-user install.' Since per user vs. all users is not an option available when installing, I can't change this. Manually running the MSI file on a client computer works fine though (and it installs it for all users). What about Group Policy application deployment would cause ALLUSERS to get unset?