IMAP Server to Exchange Migration

I am transitioning from a Linux box using an IMAP server to a 2007 Exchange server for a user base of less than 50.  Many of these users have thousands of emails stored in many folders within the "Postfix/Dovecot" server.  I have been exploring the different paths to migrating these folders and have not come to a clear path forward.  I did explore the use of "Microsoft Transporter" but have yet to get it to function properly.  Any advice or experience in the area would be appreciated.
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blaw7771Asked:
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Dave HoweSoftware and Hardware EngineerCommented:
I would suggest letting them do it themselves.

set up the exchange server and configure outlook for each user to log in using MAPI

then go back into the account, and add a second connection, via IMAP, to the old server.

then either encourage them to migrate the mail by shutting down the old server one day per week (at random) or keep it running purely as an archive/storage server for old mail, thus saving you valuable disk space on your new server :)
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blaw7771Author Commented:
The baseline that we are using is a switchover with continued access to the old mail.  However I've come to understand that there are some users that I will have to migrate in some fashion during the switchover.  Assuming that I will have some users set up separate IMAP connections in their Outlook what I am looking for is a way to migrate the folders of those that I will have to give personal attention to(ie Partners).  So this gives me two more paths of questions:  Once the emails are accessible in Outlook via IMAP can I make them a permanent part of Exchange so as to remove the IMAP connection (my assumption is that I may be able to drag and drop to the personal folder)?  And second I would like to find a way to backup the folders and their contents in a more global fashion and have them imported into Exchange.
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Dave HoweSoftware and Hardware EngineerCommented:
yes, you can just drag and drop the folders (with all email still inside) into their new homes, and/or emails from old inbox to new. you can do this either to a personal folder (pst file) or directly into exchange, where they will be indistinguishable from "native" emails.

you can also do this in an automated fashion with a bit of scripting - you can access imap from most scripting languages (although vbscript requires a free activex control) so you could log into exchange/imap and postfix/imap with a script, then copy the mails across one at a time.

however, unless there is a hurry to get the users shifted (or you feel some of the users would be confused by having two mailboxes visible) it is easier to just let the users do this themselves.
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Dave HoweSoftware and Hardware EngineerCommented:
I don't see why this is to be deleted - I gave an answer, and the querient didn't object to it.
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