I create an application for deployment of the BlueCoat X64 Unified Agent 4.6.0.157065
I use the following command switch msiexec /i "UnifiedAgentInstaller64-4.6.0.157065.msi" /qn /norestart
I successfully deploy it to a test computer and now its sitting under the Software center with a restart required legend.
Do i maybe need to use a different command switch?