How to Intergrated OWA/HTTP Systems with Cent OS Linux Based OS (Mail Box)

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http://www.linuxquestions.org – Hi Friends Can you please help me out with regards to Hybrid Set Up Query that I`ve In SetUp there Mail Flow as Follow a)AllIncoming and outgoing mail gets scanned for Anti VIrus and Anti Spam by Messaging Gateway. b)User access there mails via OWA/HTTP Server. c)Users get authenticated by AD first and then get connected to MS Exchange 2003 systems which internal generated SSL certificate by Microsoft. Cn u plz help how do I connect OWA/https systems with backend Linux based Postfix systems ? Please revert asap Thanks (HowTos)