The first thing you need to do is make sure your Exchange server has service pack 2 loaded. Without service pack 2 the iPhone will not sync correctly. You can check the service pack level by opening System Manager in the Exchange program folder. Then click the + next to Servers and right click your server and choose Properties. The service pack level will be listed there.
If you are not running 2, you can download it from here:
http://www.microsoft.com/downloads/details.aspx?FamilyId=535BEF85-3096-45F8-AA43-60F1F58B3C40&displaylang=en
Now if you are already running service pack 2, then the next thing you need to check is that you are allowing port 80 through your firewall to your Exchange server (if you use Outlook Web Access your are already forwarding port 80 and can skip this step).
Finally, if you do not have an SSL certificate from a trusted provider like Verisign, then in most cases you need to turn off the SSL check on the iPhone. Tap Settings -> Mail, Contacts, Calendars -> your Exchange account -> Account Info. Then turn Use SSL off.
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