I have noticed this behavior (seems like a bug) with Outlook 2003
When outlook main window is active, press Windows key + M (minimize all). Instead of outlook window getting minimized, it looses the focus and hence does not get minimized. This does not happen with any other office 2003 applications. I am using Windows XP. BTW, if I use right click on Taskbar ->Select Show the Desktop, outlook window gets minimized correctly. It seems that piece of code that handles active outlook for “Show the Desktop” function is not present for “windows button + M function when outlook is active window. A severiy 3 or 4 type of bug?