How to import PST extracted from Exchange db to linux IMAP server

I had an Exchange 2000 server that crashed, I recovered the PST mailboxes from the .edb database.

Now I'll move to a linux webhosting with imap support. I've to import the PST contents in the respective new mailboxes on the new server.

I've already tried several ways:

1- OUTLOOK IMPORT: Importing using import/export wizard fails because it complains about destination folder containing different "type of objects" (Note: translation from italian message) than the source one

2- OUTLOOK MOVING FOLDERS: tried to attach PST to outlook and move folders of mailbox in the IMAP mailbox also connected to outlook… but same way: impossible to move folders: I have to create every single folder and move the mails into (but is a big PITA for 16 Gb of mailboxes)

3- Using Linux converted PST to MBOX using "readpst" on ubuntu, then tried to import using ImportExportTools from Thunderbird extensions, but again no luck, I can just put this in local storage but not import these folders directly in IMAP account.

anybody can help me?

thanks