@James Kindon When a user who is not in "X" group and has Visio masked to them tries to use other office apps they would get errors when a shared dll or registry key is attempted to be accessed by outlook/word/excel. You have to install separately, and use redirection rules for shared registry keys. For example, what would happen if you masked hklm:/software/classes/htmlfile? It is a registry key used for both Visio and the regular office install. You'd start breaking things in your default office install... there are a ton of shared keys in classes...