In the application logs, you will see following warning:
Log Name: Application
Source: MSExchange ActiveSync
Event ID: 1008
Task Category: Requests
An exception occurred and was handled by Exchange ActiveSync. This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership. This can occur if a user tries to modify the same item from multiple computers. If this is the case, Exchange ActiveSync will re-create the partnership with the device. Items will be updated at the next synchronization.
URL=/Microsoft-Server-ActiveSync/default.eas?User=<user Name>&DeviceId=<Device ID>&DeviceType=iPhone&Cmd=FolderSync
--- Exception start ---
Exception type: Microsoft.Exchange.AirSync.AirSyncPermanentException
Exception message: A null value was received for the NTSD security descriptor of container CN=ExchangeActiveSyncDevices,CN=<User Name>,OU=SBSUsers,OU=Users,OU=MyBusiness,DC=contoso,DC=local.
Exception level: 0
This request does not contain a WBXML response.
Exception stack trace: at Microsoft.Exchange.AirSync.ADDeviceManager.SetActiveSyncDeviceContainerPermissions(ActiveSyncDevices container)
at Microsoft.Exchange.AirSync.ADDeviceManager.CreateActiveSyncDeviceContainer(Boolean retryIfFailed)
at Microsoft.Exchange.AirSync.ADDeviceManager.CreateActiveSyncDevice(GlobalInfo globalInfo, ExDateTime syncStorageCreationTime, Boolean retryIfFailed)
at Microsoft.Exchange.AirSync.ADDeviceManager.CreateActiveSyncDevice(GlobalInfo globalInfo, ExDateTime syncStorageCreationTime)
at Microsoft.Exchange.AirSync.Command.UpdateADDevice(GlobalInfo globalInfo)
--- Exception end ---.
- Open Active Directory Users and Computers.
- On the menu at the top of the console, click View > Advanced Features.
- Locate and right-click the mailbox account in the console, and then click Properties.
- Click the Security tab.
- Click Advanced.
- Make sure that the check box for "Include inheritable permissions from this object's parent" is selected.