iPhone OS 3.1 now enforces Exchange encryption policy, may block pre-3GS iPhones
The Unofficial Apple Weblog (TUAW) —
Filed under: Enterprise, iPhone, iPod touchThe Apple Support forums are a'buzz with reports of several users upgrading to iPhone OS 3.1 and discovering a new "feature" which was not available previously. As mentioned in our comments, after upgrading to 3.1, some original iPhone and iPhone 3G owners with Exchange accounts are having trouble accessing their email. Apparently the server-side encryption policy option for mobile devices (only available as of Exchange 2007 SP1) is now being appropriately enforced. ...
iPhone 3.1 breaking Exchange e-mail for iPhone 3G users?
Macworld —
... , wireless ringtone-downloads, app organizer tools within iTunes and more. But iPhone 3.1 also seems to have had an undesired effect on many first-generation iPhone and iPhone 3G users who receive corporate e-mail on their devices via Microsoft Exchange. Apple’s support forum pages are quickly filling up with reports from frustrated enterprise iPhone users who attempted to sync information via iPhone with Exchange servers after upgrading to iPhone 3.1, but received the following error message: The accountrequires encryption which is not supported on this iPhone. However, ...
iPhone 3.1 Blocks Encrypted Exchange Email On Non-3GS iPhones
iPhone Alley - RSS —
... , several readers who use Microsoft Exchange email on their iPhones have reported that they're unable to retrieve encrypted messages after upgrading to iPhone 3.1. ...

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