To clarify the other persons post a bit, the Home and Student version of
Office 2007 doesn't come with Outlook 2007. This link:
http://office.microsoft.com/en-us/products/FX101635841033.aspx
contains a comparison chart of which editions of Office 2007 ship with
Outlook 2007.
Other than that, Add/Remove programs in the control panel might state which
edition of Office 2007 you have installed.
Any other words of advice I can give... oh, you can purchase Outlook 2007
separately. Just keep in mind that if you already have Home and Student
edition, that some features will end up missing because the "entire" install
didn't come from the same edition.