Lots of people aren't aware of this little "trick" and it is very handy when debugging a temperamental RPC over HTTP connection. Normally, the "Connection Status" dialog box only shows up if you launch Outlook with "/rpcdiag".
If you hold down [Ctrl], and then right click on the Outlook tray icon, with Outlook 2007, "Connection Status" and "Test E-mail AutoConfiguration" appear. E-mail AutoConfiguration testing is handy for Exchange 2007 setups.
Just passing this along as an FYI because whenever I show it to people, 9 times out of 10, they have never seen those options before.
Source : Aaron Tiensivu's Blog