Copy the PST to a Mac running Outlook 2001.
Make a new PST on the Mac.
Copy the emails from the XP PST to the new Mac PST.
Use the Microsoft PST Import Tool.
You can get it here:
http://www.versiontracker.com/dyn/moreinfo/macosx/26148
Use the tool to import the new Mac PST to Entourage.
This is a very good solution if you are on an Exchange Server.
You can only go this route if you are on Exchange Server, because you need
Exchange to run Outlook 2001 (which is free, BTW) on your Mac. If you have
only a self-standing Outlook on your PC, and no Exchange, you won't be able
to go this route.
Also, if you happen to use a lot of the more obscure fields in Outlook, a
lot of them will be missing when you import the PST into Outlook 2001.
(Outlook 2001 has only some 28 contact fields vs. Outlook XP's 92 fields,
for example.) If this matters to you, or if you're not on Exchange, you can
get your data over to Entourage via my Export-Import Entourage scripts at
MacScripter.net <
http://macscripter.net/scriptbuilders/>