Calendar changes are not synchronized from an iOS 8.3 device in some time zones

Applies to: Exchange OnlineExchange Server 2010 EnterpriseExchange Server 2013 Enterprise


Changes to calendar items that are made on an iOS 8.3 device are not synchronized to Microsoft Outlook or Outlook Web App (OWA) mailboxes.

Note This issue does not apply to all time zones or regions. Known regions that are affected include Lebanon, Egypt, and parts of Brazil.

Additionally, the following exception is logged to the Exchange ActiveSync mailbox log for this device:

SyncCommand_ConvertRequestsAndApply_Add_Exception : 
Microsoft.Exchange.AirSync.SchemaConverter.Common.ConversionException: ExTimeZoneFromRegTimeZoneInfo failed: Specified argument was out of the range of valid values.
Parameter name: Hour
at Microsoft.Exchange.AirSync.SchemaConverter.Common.TimeZoneConverter.GetExTimeZone(Byte[] timeZoneInformation)
at Microsoft.Exchange.AirSync.SchemaConverter.XSO.XsoTimeZoneProperty.InternalCopyFromModified(IProperty srcProperty)
at Microsoft.Exchange.AirSync.SchemaConverter.XSO.XsoDataObject.CopyFrom(IProperty srcRootProperty)
at Microsoft.Exchange.AirSync.SyncCollection.ConvertClientToServerObjectAndSendIfNeeded(SyncCommandItem syncCommandItem, Boolean sendEnabled)
at Microsoft.Exchange.AirSync.SyncCollection.ConvertClientToServerObjectAndSave(SyncCommandItem syncCommandItem, UInt32& maxWindowSize, Boolean& mergeToClient)
at Microsoft.Exchange.AirSync.SyncCommand.ConvertRequestsAndApply(SyncCollection collection)


This issue occurs because the TimeZone value in the sync request is invalid.


This issue has been addressed in an iOS 8.4 update. For more information, see the following Apple Knowledge Base article: