They're two different programs.. Outlook Express comes with Internet Explorer and as long as it's not uninstalled, it should be there.. On the other hand, Microsoft Office Outlook must be installed separately using a Microsoft Office CD. Which are you trying to open?

In order to open Outlook Express, you need to click on Start-All Programs-Outlook Express.. How are you currently trying to open Outlook Express?

Hope this helps and let us know more.