Don't waste time considering this option.
Seriously.
I've had the same problem this summer, and I have tried to implement Openchange protocol.
I have succeeded in connecting to mailboxes and  in downloading messages on a local mailbox.
I've also piped the mails collected through Postmaster script onto OTRS.
I did a LOT of work but the issues remains simply too much to use this solution in a production environment.
So definitely go and ask to enable POP3 or IMAP on per-mailbox basis: this is the only reliable way, now.
If you really need it, your mail admins should (and could) do this.
Period. 
Ciao, d.
 
Da: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] Per conto di Bryan R. James
Inviato: lunedì 9 febbraio 2009 21.18
A: otrs@otrs.org
Oggetto: [otrs] Latching onto Exchange

I’m new to the OTRS list, but google-fu failed me so please forgive me if I missed this in my searching.

 

I’ve got OTRS setup on a Ubuntu 8.10 server I’d like it to be able to pull e-mails from our Exchange server, however the admins who take care of the Exchange box can’t/won’t enable either IMAP or POP3.  It does have the web interface enabled though.  Is there anyway I can use the OWA access to get the mail similar to the way Evolution works with Exchange to pull the mail into OTRS?

 

Bryan