iOS4 & ActiveSync Problems:
Exchange Mail, Contacts, or Calendars may not sync after update.
We have been reading many articles all over the web about users who have recently upgraded to the latest iOS4 for their iPhone. This new OS is also standard on the iPhone4. Although Exchange My Mail has not suffered from this issue yet, we want to be proactive about it. We are closely monitoring our ActiveSync infrastructure.
It has been reported by Apple, that “immediately after updating to iOS 4, some users may notice that Exchange ActiveSync Mail, Contacts, or Calendars do not sync, or sync very slowly. In addition, some Exchange Server administrators may notice their servers running slowly”.
Microsoft has classified this as a client side issue related to the Apple iOS4 update and is not planning to release a patch or update.
Apple has released a knowledge base article and a configuration patch for impacted phones which can be found at the following URL: http://support.apple.com/kb/TS3398
If you are upgrading your iPhone or have purchased a new iPhone4 device you MUST install the configuration update above. Failure to do so will result in incomplete sync of your items and may cause performance issues. If you run an iOS4 device without the configuration patch above your device may be disabled for policy violation to prevent performance issues.