I'm using Outlook 2010 on Windows XP SP3. Outlook starts and runs fine, but when I close Outlook and attempt to reopen it I get the now famous dialog "Cannot start Microsoft Outlook." That is the complete message. If I logoff and logon again, Outlook starts and runs fine. I tried the /resetnavpane option, but that did not help. I do have some Outlook add-ins but Task Manager shows that Outlook.exe is not running when I get this error message.