Configuring Exchange 2003 Server to get Mail from MDaemon Mail Server

Dear All,

We got 2 Branch (one in USA & Second is in Mumbai)
Our Mail Server (MDaemon Mail Server) which is Locate at USA.
So User connects directly to USA Mail Server.
Now management as decided to install Exchange 2003 locally and route all internal mail through Exchange. We do not want to remove MDaemon Mail Server.
In MDaemon Mail Server I have forward User mails pointing to local Exchange Server.
But I do not know how to configure Exchange Server so that I get mails from MDaemon Mail Server.

Please help me or give me nay link from where I can get the help for above problem.

Regards,

Girish Jain