Per the following article http://www.tuaw.com/2009/09/10/iphone-os-3-1-now-enforces-exchange-encryption-policy-may-block/ users that have an Iphone that is not a 3GS may not be able to sync when connected to Exchange 2007 SP1+ system due to the encryption policy.
J. Peter Bruzzese has developed a nice Exchange site with instructional video clips that you may find useful. http://www.exclusivelyexchange.com/index.html
Yesterday Microsoft released Rollup 7 for RTM and Rollup 3 for SP1 This update contains a few CRITICAL updates and should be appliedhttp://www.microsoft.com/technet/security/bulletin/MS08-039.mspx Rollup3 SP1http://www.microsoft.com/downloads/details.aspx?FamilyId=63E7F26C-92A8-4264-882D-F96B348C96AB&displaylang=enhttp://support.microsoft.com/?kbid=949870 Rollup 7 RTMhttp://www.microsoft.com/downloads/details.aspx?FamilyId=086A2A13-A1DE-4B1D-BD12-B148BFD2DAFA&displaylang=enhttp://support.microsoft.com/?kbid=953469
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