Exchange Web Services error synchronizing folder - hexadecimal value

Can’t synch exchange all the sudden! I have to use the crappy web interfaces.

[Exchange Web Services] MailClient.Storage.Application.OperationException: Synchronizing folder ‘----@—.com/Inbox’ failed due to the following error: ‘’, hexadecimal value 0xFFFF, is an invalid character. Line 694, position 33.
—> System.Xml.XmlException: ‘’, hexadecimal value 0xFFFF, is an invalid character. Line 694, position 33.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars)
at System.Xml.XmlTextReaderImpl.ParseText()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlTextReader.Read()
at System.Xml.XmlCharCheckingReader.Read()
at Microsoft.Exchange.WebServices.Data.EwsXmlReader.Read()
at Microsoft.Exchange.WebServices.Data.ComplexProperty.InternalLoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName, Func2 readAction) at Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName) at Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName) at Microsoft.Exchange.WebServices.Data.ComplexPropertyDefinitionBase.InternalLoadFromXml(EwsServiceXmlReader reader, PropertyBag propertyBag) at Microsoft.Exchange.WebServices.Data.ComplexPropertyDefinitionBase.LoadPropertyValueFromXml(EwsServiceXmlReader reader, PropertyBag propertyBag) at Microsoft.Exchange.WebServices.Data.PropertyBag.LoadFromXml(EwsServiceXmlReader reader, Boolean clear, PropertySet requestedPropertySet, Boolean onlySummaryPropertiesRequested) at Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader.ReadServiceObjectsCollectionFromXml[TServiceObject](XmlNamespace collectionXmlNamespace, String collectionXmlElementName, GetObjectInstanceDelegate1 getObjectInstanceDelegate, Boolean clearPropertyBag, PropertySet requestedPropertySet, Boolean summaryPropertiesOnly)
at Microsoft.Exchange.WebServices.Data.GetItemResponse.ReadElementsFromXml(EwsServiceXmlReader reader)
at Microsoft.Exchange.WebServices.Data.ServiceResponse.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName)
at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.ParseResponse(EwsServiceXmlReader reader) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ReadResponse(EwsServiceXmlReader ewsXmlReader) at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponseXml(Stream responseStream) at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponse(IEwsHttpWebResponse response) at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.Execute()
at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalLoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet, ServiceErrorHandling errorHandling) at Microsoft.Exchange.WebServices.Data.ExchangeService.LoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet)
at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.ChangesToItems(ExchangeService service, IEnumerable1 changes, CancellationToken cancellationToken)+MoveNext()
at System.Collections.Generic.List1.InsertRange(Int32 index, IEnumerable1 collection)
at MailClient.Protocols.Common.ItemSynchronizeContext2.<>c__DisplayClass18_03.g__FlushItems|1(Int32 threshold)
at MailClient.Protocols.Common.ItemSynchronizeContext2.Synchronize[T,TUid,TVid](SynchronizationType synchronizationType, IEnumerable1 items, Func2 getUniqueId, Func2 getVersionId, Func3 hasChanged, Func2 isDeleted, Func2 convertItems, Action2 updateItem)
at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)
at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass37_1.<EnqueueSynchronize>b__6(WorkerStatus status, CancellationToken ct) at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status) --- End of inner exception stack trace --- at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status) at MailClient.Commands.Command.Process(WorkerStatus status) --- End of stack trace from previous location --- at MailClient.Protocols.Exchange.ExchangeAccount.SynchronizeIntAsync(Boolean forced) at MailClient.Protocols.Common.SynchronizableMailAccount.<>c__DisplayClass6_0.<<SynchronizeAsync>b__0>d.MoveNext() EnqueuedStackTrace = at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass37_1.g__RunSynchronize|2()
at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass37_0.<EnqueueSynchronize>b__0() at MailClient.Protocols.Common.AccountBase.RunIfOnline(Action actionIfOnline, Action actionIfOffline) at MailClient.Protocols.Common.ItemSynchronizer2.EnqueueSynchronize(Folder folder, Boolean fast, CancellationToken cancellationToken, Action1 completed) at MailClient.Protocols.Common.ItemSynchronizer2.MailClient.Storage.Synchronization.IItemSynchronizer.Synchronize(Folder folder, SynchronizationPriority priority, Action1 completed) at MailClient.Storage.Application.ItemCollection2.Synchronize(SynchronizationPriority priority, Action1 completed) at MailClient.Storage.Application.Folder.Synchronize(SynchronizationPriority priority) at MailClient.Protocols.Common.FolderSynchronizer.SynchronizeFoldersForOfflineUse(IEnumerable1 folders)
at MailClient.Protocols.Common.FolderSynchronizer.<>c__DisplayClass14_1.b__1(CompletionEventArgs completionEventArgs)
at MailClient.Protocols.Common.RequestIssuer.<>c__DisplayClass9_0.b__0(Object sender, CompletionEventArgs e)
at MailClient.Commands.Command.Complete()
at MailClient.Commands.Command.Process(WorkerStatus status)
at MailClient.Commands.SynchronizationQueue.ThreadWorker(Object threadData)
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart(Object obj)
GUIStatus_Exception_Reported = True