If you will never have to go back to the Windwos world again with the mail, you might want to look at something along the lines of MailSteward for archiving mail on the Mac.
With the mail on Exchange you could also move it from Exchange to an IMAP account such as Gmail in Outlook. Now the mail from the PST file is back in the user's mailbox, and any mail client that can connect to Exchange can pull it in and you can use Exchange archiving instead of PST. New-MailboxImportRequest -Mailbox -FilePath \\server\E$\ExchangeExports\username1_YYYY-MM-DD.pst If you have the service space available, you could copy the PST file up to your Exchange server and import the PST file into the user's mailbox using PowerShell (this is for Exchange 2010, should work in 20 I think.) Possibly not the best solution as now it will be in Office 2011 Mac format, which is incompatible with Outlook for Windows. I'm still not clear on your goal, but the easiest thing to do would be to purchase Office 2011 for Mac, which would let you import the PST file in. It's Mac, not MAC! MAC makes me think Media Access Control address.
