Connecting to Exchange.

Our Parent company in the states is moving our email to and exchange server over there.  They do not plan to implement POP or IMAP.  Will there still be a way to connect Pegasus to my account?  I am currently able to set up a forward to the domain which points at our Mercury server here but that may get turned off as they are understandably keen to have all email appear to come from their domain and their IP address.

I ask because I understand that there is a plug in for Thunderbird to enable it to access Exchange and I wondered is anyone had written anything similar for Pegasus.