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It turns out that Microsoft Outlook post office files (PST files) aren't supported by Microsoft Entourage. Brilliant, Microsoft. Thanks for all your support.

And even if you search for "can i move outlook pst files to entourage?" or anything similar to that, you don't even find a microsoft.com page among the search results.

Here was the most helpful (i.e. direct) info I got:

http://www.entourage.mvps.org/import_export/pst.html

But it turns out you can buy a program that you can install inside of Outlook to convert the subfolders one by one from Outlook to MBOX format, then you can copy them over to your Mac on a thumb drive, then you can install them in Entourage by drag-n-drop, and then you can re-organize them there.

That's great. I probably have 150 subfolders in my current Outlook PST. And then I have I think 6 archive PST's to convert, going back several years.

I'll let you know how that goes.