Howto migrate from postfix-cyrus to Exchange

[Rafael Alcalde]

Hi,

we are going to migrate (most likely) to Exchange and the main reason 
are the shared calendars, resource booking, connections to pal, mobile 
devices...and JAVA APIS to integrate this system to our ERP.

So, someone has another idea?
can you tell me the procedure to migrate the postfix accounts and 
mailboxes to exchange?

Thanks in advance!

Rafael Alcalde