On a laptop with Win XP and Outlook 2010:
Through an apparently random keystroke sequence I somehow made the window containing Outlook semi-transparent! Very weird. Everything else looks normal. Stopping and restarting Outlook didn't change anything; the window is still semi-transparent.
I can't find an Outlook option to reset this to normal. Is this an Outlook thing? A Win XP thing? How do I return the window to normal?