Hello very nice intelligent helper people, I keep getting this error when I try to start Outlook: Cannot start Microsoft Outlook. Outlook requires Microsoft Outlook Express 4.01 or greater. You can install Outlook Express by running IE5Setup.exe from the IE5 folder located on your CD or through the Windows Update website. " My outlook express 6.0 works just fine so I would think that Outlook would also work. Outlook used to work just fine. I want to use Outlook in conjuction with Excel 2002 with SP3 to send out a mailer to my customers. Thanks for your help.