How can I get imported Outlook email into folders in mail?

Question

I am a longtime PC user with email and calendar in MS Outlook (finally) converting to an iMac.  I used the Migration Assistant to transfer my old PC email to new iMAC running OSX Lion via ethernet.  On the old PC, I have ~15 years of stored emails in a *.pst file, organized by folders.  I want to retain that file structure to organize older email (but retain it on hard drive for later access) in mail on the iMac.  For example, I get an email confirmation of an online order, I move it to a folder called "Money" in case I have any problems with the item or need ot figure out how long since I purchased something for warranty.  After the migration I have 1,984 messages in my inbox on the iMac.
Two apparent problems: 
1) Everything is in one folder.  I don't want to have to refile all this stuff again.  How do I get an intact folder structure imported to iMac email from Outlook 2000 *.pst file?
2)  I don't think the migration moved everything form the old pst.  It took more than inbox, but not enough to be all the emails.  To avoid duplications, should I scrub the iMAC mail clean before any steps to achieve 1 above?  If so how do I remove the emil imported the first try to iMac?
Be gently, true newbie status here.  Learning the iMac slowly - but can't go for long without email.....

Answer 1

Hi. I have a similar issue. Migration assistant seems to have pulled in all my email accounts (6) correctly and also the mails that were sat in those inboxes. However, the entire folder structure (where I would drag and drop) has not migrated and nor (it seems) the email contained within. I also have a .pst (which is not corrupted on the PC) and is not huge. So I would like to move all my history across. I don't particularly care about the folder structure but I do, of course, want all of my history transferred.
Is there any easy way to do this? Otherwise all I can think of is moving all emails on my PC from the folders to an inbox in Outlook, unarchiving the .pst emails and then doing the email migration all over again.
Thanks for any help.