MSExchange ActiveSync Event ID 10008

Hello experts -

I am seeing a reoccuring warning pop up in the event viewer of my exchange 2010 server. I am wondering what it is referring to or how to resolve the warning so it does not show up in the event viewer going forward. See details below.

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 This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership.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=xxxxxxxxxxx&DeviceId=xxxxxxxxx&DeviceType=iPhone&Cmd=Ping
--- Exception start ---
Exception type: Microsoft.Exchange.Data.Storage.ObjectNotFoundException
Exception message: Cannot get ID from name.
Exception level: 0
Exception stack trace:   at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.GetIdsFromNamedProps(Boolean allowCreate, IList`1 namedProps)
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.GetIdsFromNamedPropsWithRetry(Boolean allowCreate, List`1 resolveList)
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.ResolveAllNamedProperties(Int32 startFrom)
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.Enumerator.GetPropertyTagFromNamedProperty(NamedPropertyDefinition propertyDefinition)
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.Enumerator.get_Current()
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.CopyTo(PropTag[] array, Int32 index)
  at Microsoft.Mapi.PropTagHelper.SPropTagArray(ICollection`1 tags)
  at Microsoft.Mapi.MapiProp.GetProps(ICollection`1 propTagsRequested)
  at Microsoft.Exchange.Data.Storage.MapiPropertyBag.GetProperties(IList`1 propertyDefinitions)
  at Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag.InternalLoad(ICollection`1 extraProperties)
  at Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag..ctor(StoreSession session, MapiProp mapiProp, ICollection`1 autoloadProperties, Boolean canSaveOrDisposeMapiProp)
  at Microsoft.Exchange.Data.Storage.StoreObjectPropertyBag..ctor(StoreSession session, MapiProp mapiProp, ICollection`1 autoloadProperties)
  at Microsoft.Exchange.Data.Storage.ItemBuilder.CoreItemBind(StoreSession session, StoreId storeId, MapiMessageCreator mapiMessageCreator, ItemBindOption itemBindOption, ICollection`1 propertiesToLoad, StoreObjectType& storeObjectType)
  at Microsoft.Exchange.Data.Storage.ItemBuilder.ItemBind[T](StoreSession session, StoreId storeId, Schema expectedSchema, MapiMessageCreator mapiMessageCreator, ItemBindOption itemBindOption, ICollection`1 propertiesToLoad)
  at Microsoft.Exchange.Data.Storage.Item.Bind(StoreSession session, StoreId storeId, ItemBindOption itemBindOption, ICollection`1 propsToReturn)
  at Microsoft.Exchange.Data.Storage.SyncState.Deserialize(PropertyDefinition property)
  at Microsoft.Exchange.Data.Storage.SyncState.Load(Boolean reloadFromBackend, PropertyDefinition[] additionalPropsToLoad)
  at Microsoft.Exchange.Data.Storage.FolderSyncState.Load(Boolean reloadFromBackend, PropertyDefinition[] additionalPropsToLoad)
  at Microsoft.Exchange.Data.Storage.FolderSyncState..ctor(SyncStateStorage syncStateStorage, StoreObject storeObject, SyncStateInfo syncStateInfo, ISyncProviderFactory syncProviderFactory, Boolean newSyncState)
  at Microsoft.Exchange.Data.Storage.FolderSyncState.GetSyncState(SyncStateStorage syncStateStorage, Folder syncStateParentFolder, ISyncProviderFactory syncProviderFactory, String syncFolderId, StoreObjectId storeObjectId)
  at Microsoft.Exchange.Data.Storage.SyncStateStorage.GetFolderSyncState(ISyncProviderFactory syncProviderFactory, String syncFolderId)
  at Microsoft.Exchange.AirSync.SyncCollection.OpenSyncState(Boolean autoLoadFilterAndSyncKey, SyncStateStorage syncStateStorage)
  at Microsoft.Exchange.AirSync.GetItemEstimateCommand.GetChanges(SyncCollection collection, Boolean autoLoadFilterAndSyncKey, Boolean tryNullSync, Boolean commitSyncState)
  at Microsoft.Exchange.AirSync.PingCommand.FolderChangedSinceLastSync(DPFolderInfo folder, GetItemEstimateCommand command, SyncCollection collection, Boolean tryNullSync)
  at Microsoft.Exchange.AirSync.PingCommand.ItemsChangedSinceLastSync()
  at Microsoft.Exchange.AirSync.PingCommand.ExecuteCommand()
  at Microsoft.Exchange.AirSync.Command.WorkerThread()
Inner exception follows below:
Exception type: Microsoft.Mapi.MapiExceptionNotFound
Exception message: MapiExceptionNotFound: Unable to get IDs from property names. (hr=0x80004005, ec=-1601)
Diagnostic context:
    Lid: 55847 EMSMDBPOOL.EcPoolSessionDoRpc called [length=822]
    Lid: 43559 EMSMDBPOOL.EcPoolSessionDoRpc returned [ec=0x0][length=378][latency=0]
    Lid: 23226 --- ROP Parse Start ---
    Lid: 27962 ROP: ropOpenMessage [3]
    Lid: 17082 ROP Error: 0xFFFFF9BF
    Lid: 26977
    Lid: 21921 StoreEc: 0xFFFFF9BF
    Lid: 27962 ROP: ropExtendedError [250]
    Lid: 1494   ---- Remote Context Beg ----
    Lid: 26426 ROP: ropOpenMessage [3]
    Lid: 23921 StoreEc: 0x3EC  
    Lid: 21970 StoreEc: 0x8004010F PropTag: 0x65E30102
    Lid: 23921 StoreEc: 0x3EC  
    Lid: 21970 StoreEc: 0x8004010F PropTag: 0x65E20102
    Lid: 23921 StoreEc: 0x3EC  
    Lid: 21970 StoreEc: 0x8004010F PropTag: 0x65E00102
    Lid: 23921 StoreEc: 0x3EC  
    Lid: 21970 StoreEc: 0x8004010F PropTag: 0x668F0040
    Lid: 21097
    Lid: 39027 dwParam: 0x7695DB4D
    Lid: 8756   StoreEc: 0xFFFFF9BF
    Lid: 58765 StoreEc: 0xFFFFF9BF
    Lid: 4353   StoreEc: 0xFFFFF9BF
    Lid: 17114
    Lid: 6153   StoreEc: 0xFFFFF9BF
    Lid: 21810
    Lid: 5249   StoreEc: 0xFFFFF9BF
    Lid: 37123
    Lid: 59651 StoreEc: 0xFFFFF9BF
    Lid: 1750   ---- Remote Context End ----
    Lid: 27962 ROP: ropGetIDsFromNames [86]
    Lid: 17082 ROP Error: 0x4B9  
    Lid: 16993
    Lid: 21921 StoreEc: 0x4B9  
    Lid: 27962 ROP: ropExtendedError [250]
    Lid: 1494   ---- Remote Context Beg ----
    Lid: 26426 ROP: ropGetIDsFromNames [86]
    Lid: 1750   ---- Remote Context End ----
    Lid: 26849
    Lid: 21817 ROP Failure: 0x4B9  
    Lid: 37224
    Lid: 40808 StoreEc: 0xFFFFF9BF
    Lid: 24529
    Lid: 18385 StoreEc: 0xFFFFF9BF
Exception level: 1
Exception stack trace:   at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, SafeExInterfaceHandle iUnknown, Exception innerException)
  at Microsoft.Mapi.MapiProp.GetIDsFromNames(Boolean fCreateIfNotExists, ICollection`1 np)
  at Microsoft.Exchange.Data.Storage.PropertyDefinitionToPropTagCollection.GetIdsFromNamedProps(Boolean allowCreate, IList`1 namedProps)
--- Exception end ---.