So in Snow Leopard, you could use this command (defaults write com.apple.itunes AppleDisplayScaleFactor 0.85) in terminal to zoom a program (in this case iTunes) without affecting the rest of the system. I just upgraded a system to Mtn Lion and my client is not happy to lose this function. Is there anything comparable that works for Mtn Lion? She wants to zoom outlook by 25% so she can read everything better. Thanks for any help!