calendar problem Exchange

23:03:43 *@*.ru [Exchange Web Services]  MailExceptions.ConnectionException: Элемент с тем же ключом уже был добавлен. —> System.ArgumentException: Элемент с тем же ключом уже был добавлен.23:03:43    в System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
23:03:43    в System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) 23:03:43    в Microsoft.Exchange.WebServices.Data.TimeZoneDefinition.TryReadElementFromXml(EwsServiceXmlReader reader) 23:03:43    в Microsoft.Exchange.WebServices.Data.ComplexProperty.InternalLoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName, Func2 readAction)
23:03:43    в Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName)
23:03:43    в Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName)
23:03:43    в Microsoft.Exchange.WebServices.Data.TimeZonePropertyDefinition.LoadPropertyValueFromXml(EwsServiceXmlReader reader, PropertyBag propertyBag)
23:03:43    в Microsoft.Exchange.WebServices.Data.PropertyBag.LoadFromXml(EwsServiceXmlReader reader, Boolean clear, PropertySet requestedPropertySet, Boolean onlySummaryPropertiesRequested)
23:03:43    в Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader.ReadServiceObjectsCollectionFromXml[TServiceObject](XmlNamespace collectionXmlNamespace, String collectionXmlElementName, GetObjectInstanceDelegate1 getObjectInstanceDelegate, Boolean clearPropertyBag, PropertySet requestedPropertySet, Boolean summaryPropertiesOnly) 23:03:43    в Microsoft.Exchange.WebServices.Data.GetItemResponse.ReadElementsFromXml(EwsServiceXmlReader reader) 23:03:43    в Microsoft.Exchange.WebServices.Data.ServiceResponse.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName) 23:03:43    в Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.ParseResponse(EwsServiceXmlReader reader)
23:03:43    в Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ReadResponse(EwsServiceXmlReader ewsXmlReader)
23:03:43    в Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponseXml(Stream responseStream)
23:03:43    в Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponse(IEwsHttpWebResponse response)
23:03:43    в Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.Execute() 23:03:43    в Microsoft.Exchange.WebServices.Data.ExchangeService.InternalLoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet, ServiceErrorHandling errorHandling)
23:03:43    в Microsoft.Exchange.WebServices.Data.ExchangeService.LoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet) 23:03:43    в MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.d__b.MoveNext()
23:03:43 в System.Linq.Enumerable.d__313.MoveNext()<br>23:03:43 в System.Collections.Generic.List1…ctor(IEnumerable1 collection)<br>23:03:43 в System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
23:03:43 в System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)<br>23:03:43 в MailClient.Protocols.Common.ScheduleItemSynchronizeContext1.StoreItems(SynchronizationType type, IEnumerable1 newItems)<br>23:03:43 в MailClient.Protocols.Common.ItemSynchronizeContext2.Synchronize[T](SynchronizationType synchronizationType, IEnumerable1 items, Func2 getUniqueId, Func3 hasChanged, Func2 isDeleted, Func2 convertItems, Action2 updateItem)
23:03:43 в MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)
23:03:43 в MailClient.Protocols.Common.ItemSynchronizer`2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
23:03:43 в MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status)
23:03:43 — Конец трассировки внутреннего стека исключений —
23:03:43 в MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status)
23:03:43 в MailClient.Commands.Command.Process(WorkerStatus status)
23:03:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:04:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:05:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:06:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:07:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:08:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:09:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:10:43 @.ru [Exchange Web Services] Синхронизация папки '@.ru/Календарь/'
23:11:43 @.ru [Exchange Web Services] Синхронизация папки ‘@.ru/Календарь/’

Hello Ivan, unfortunately I’m not quite sure what is this referring to, can you please be a little more specific with the issue description?

When does this issue occur? Does this occur while synchronising an Exchange account? What version of eM Client are you currently using on your computer, can you please check the exact release number in Help > About?

Thank you,