Transfer email, contacts and calendar (Outloot 2003 and 07)

[flw]

I have both Outlook 2003 and 07 on a number of machines. To transfer the email, calendar and contacts, do I need more than just the pst file? if so which ones contain what information?

Also does Outlook 2007 use different file extension's than pst for mail/calendar/contacts?

Thanks for any help.