I encountered an issue after migrating SBS 2003 to SBS 2011 with a few users iphones not able to sync email any more, this was down to inheritable permissions not being ticked to fix this issue go to
- Active Directory Users and Computer
- Expand you domain and find the container with your users in it
- Right click the problem users go to properties and click the security tab
- (If the security tab isn’t their click view and tick Advanced Features)
- Click the advanced button
- Tick ‘Allow inheritable permissions from the parent to propagate to this object an all child object. Include these with entries explocoty defined here.
- Click ok, wait a few minutes then try the phone again