I have been using my iPhone 3G to access company email for months. I just upgraded to OS 3.1 today (from OS 3.0.1) and got an alert saying "The account <work> requires encryption which is not supported on this iPhone." My phone will no longer access my work email!!! I know that nothing has changed on my company Exchange servers in the last 20 minutes, so OS 3.1 must be the cause. Why can't OS 3.1 access an Exchange server if OS 3.0 & 3.0.1 have had no problems?
I'm having the exact same issue. I tried deleting my mail account and mobile device from exchange. I still get the error you get. Any one have any ideas?
Same issue here with a regular 3G. Cannot get into work email, says that the encryption used is no longer supported? Really? I rely on having this remote access.
I called apple - they said try to delete the account and enter it again - tried that - did not work. They said they are aware of it and are working on an update.
Unless there's a fix for this, the only solution would seem to downgrade from 3.1. So far this is the only forum I've found discussing the topic. If a large enough population is affected, Apple should fix it.