Here is one of those in the trenches tips that you would NEVER think of. We had a user who when they clicked on the minus symbol in the top tool bar of Outlook it disappeared completely as if it was closed. No other user was experiencing this problem. We just thought this users PC was possesed, cllick the minus the app is gone! Poof! How bizarre.
But here is what happened. At some point the user must of RIGHT CLICKED on the Outlook icon in the System Tray and chose the selection and I kid you not it is there.... that reads "Hide When Minimized" Left clicking and unchecking that choice solved her issue.
Now the real mystery to me is why in the heck would a setting like that even exist especially for an app installed in Citrix? How do you get the program back without running it again? As the ladies man from SNL would say... "Thats just crazy." Another mystery solved.