Interconnecting Exchnage and postfix

[Anze Vidmar <anzevi gmail com>]

hi!

As I mentioned before, I will move 50 users from the exchange to postfix 
(in the same domain, example.com). The plan looks like this:

Primary server on example.com domain is Exchange 2k. I need to setup 
postfix server as secondary server in the same domain for this users. 
For the users student1 example com thru student50 example com mail needs 
to be delivered on postfix server, so they can access email via IMAP and 
squirrelmail. The million dollars question is: How to accomplish this?

Here is what i think it would work fine:

Configure postfix server to host example.com domain and also to host 
virtual domain named example2.com. On the Exchange server create mail 
aliases for this users, so that student1 example com also has alias for 
student1 example2 com  Configure Exchange so that when mail for 
student1 example com arrives, send it to student1 example2 com domain 
(the postfix server). Postfix receives mail for this user. Configure 
Exchange to be a relay server for postfix. Done.

Is there any better way to accomplish this?

Any suggestions for improvement are also very welcome. Does anyone have 
experiences with this scenario? Any useful URL's  maybe?

--
Anze Vidmar <anzevi gmail com>