iPhone and iPod touch: Exchange ActiveSync requires Exchange Protocol version 2.5 or later
Summary
Exchange servers, versions 2003 and 2007, must support protocol 2.5 or later for iPhone and iPod touch devices to access Exchange services via Exchange ActiveSync.
Products Affected
iPhone, iPod touch, iPhone 3G
If you are certain that your Enterprise Exchange servers are versions 2003 or 2007 and still cannot access your Exchange accounts, speak to your IT Administrator about ensuring that your servers are running Exchange protocol 2.5 or later.
For more information, see the iPhone Enterprise Deployment Guide.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.