I am looking for a program that will run in WinXP that does basically
everything that Outlook does, but is free.  I need:
- Email capability; using several different email accounts configured
simultaneously and being able to sort emails in to different folders
- Calendar scheduling; the same type of features that the Outlook calendar has
- Contacts manager; an address book that stores much of the same information

And I think the most important feature for me would be that this new
program could import ALL my current information from my Outlook's .pst
file and I wouldn't miss a beat when switching to this new program.

I understand that I will have to make compromises on
features/functionality, but what I described above is my ideal
scenario.

Thanks in adavance for your help.

Perhaps try a combination of:

Mozilla ThunderBird Email Client
http://texturizer.net/thunderbird/features.html

Mozilla Calendar
http://www.mozilla.org/projects/calendar/