calendar synchronize problem with Exchange

Every time i synchro calendar it’s getting error.
My version now is 6.0.22930.0

Problem is: 
MailExceptions.ConnectionException: An item with the same key has already been added. —> System.ArgumentException: An item with the same key has already been added.

Hello Ivan, can you please try to perform repair on your calendar folder that’s being mentioned in the error? Right click the calendar folder in the left pane and select Properties > Repair and click on the “Repair” button and check if the issue persists.

If it does, can you please copy the whole content of the Log from Operations when the error occurs?

Thank you,

Repair dosn’t help!

The whole content:
12:13:20  ***** [Exchange Web Services]  MailExceptions.ConnectionException: An item with the same key has already been added. —> System.ArgumentException: An item with the same key has already been added.12:13:20    at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
12:13:20    at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add) 12:13:20    at Microsoft.Exchange.WebServices.Data.TimeZoneDefinition.TryReadElementFromXml(EwsServiceXmlReader reader) 12:13:20    at Microsoft.Exchange.WebServices.Data.ComplexProperty.InternalLoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName, Func2 readAction)
12:13:20    at Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, XmlNamespace xmlNamespace, String xmlElementName)
12:13:20    at Microsoft.Exchange.WebServices.Data.ComplexProperty.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName)
12:13:20    at Microsoft.Exchange.WebServices.Data.TimeZonePropertyDefinition.LoadPropertyValueFromXml(EwsServiceXmlReader reader, PropertyBag propertyBag)
12:13:20    at Microsoft.Exchange.WebServices.Data.PropertyBag.LoadFromXml(EwsServiceXmlReader reader, Boolean clear, PropertySet requestedPropertySet, Boolean onlySummaryPropertiesRequested)
12:13:20    at Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader.ReadServiceObjectsCollectionFromXml[TServiceObject](XmlNamespace collectionXmlNamespace, String collectionXmlElementName, GetObjectInstanceDelegate1 getObjectInstanceDelegate, Boolean clearPropertyBag, PropertySet requestedPropertySet, Boolean summaryPropertiesOnly) 12:13:20    at Microsoft.Exchange.WebServices.Data.GetItemResponse.ReadElementsFromXml(EwsServiceXmlReader reader) 12:13:20    at Microsoft.Exchange.WebServices.Data.ServiceResponse.LoadFromXml(EwsServiceXmlReader reader, String xmlElementName) 12:13:20    at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.ParseResponse(EwsServiceXmlReader reader)
12:13:20    at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ReadResponse(EwsServiceXmlReader ewsXmlReader)
12:13:20    at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponseXml(Stream responseStream)
12:13:20    at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponse(IEwsHttpWebResponse response)
12:13:20    at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1.Execute() 12:13:20    at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalLoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet, ServiceErrorHandling errorHandling)
12:13:20    at Microsoft.Exchange.WebServices.Data.ExchangeService.LoadPropertiesForItems(IEnumerable1 items, PropertySet propertySet) 12:13:20    at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.d__b.MoveNext()
12:13:20 at System.Linq.Enumerable.d__313.MoveNext()<br>12:13:20 at System.Collections.Generic.List1…ctor(IEnumerable1 collection)<br>12:13:20 at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source)
12:13:20 at System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)<br>12:13:20 at MailClient.Protocols.Common.ScheduleItemSynchronizeContext1.StoreItems(SynchronizationType type, IEnumerable1 newItems)<br>12:13:20 at MailClient.Protocols.Common.ItemSynchronizeContext2.Synchronize[T](SynchronizationType synchronizationType, IEnumerable1 items, Func2 getUniqueId, Func3 hasChanged, Func2 isDeleted, Func2 convertItems, Action2 updateItem)
12:13:20 at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)
12:13:20 at MailClient.Protocols.Common.ItemSynchronizer`2.<>c DisplayClass2e.<>c DisplayClass33.b__2a(WorkerStatus status, CancellationToken cancellationToken)
12:13:20 at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status)
12:13:20 — End of inner exception stack trace —
12:13:20 at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status)
12:13:20 at MailClient.Commands.Command.Process(WorkerStatus status)

Hello, can you please create some additional logging data for us, please navigate to Tools > Settings > Advanced and enable Exchange Web Services logging for the problematic account? Save the settings and replicate the issue, once the error reoccurs, please restart the application and navigate back to the advanced settings window to submit the logging data.

Please submit the logs to my work mail, mcgregor@emclient.com with a reference link to this forum topic for more information about this issue.

Thank you,

I’ve send you, thanks for helping.

Any news?

Any news?