synchronizing folder .... the method or operation is not implemented - Exchange 2010

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11:15:16  [Exchange Web Services]  Synchronizing folder ‘CPD/Inbox/’
11:15:17   System.NotImplementedException: The method or operation is not implemented.
11:15:17    at MailClient.Storage.Mail.Data.DbMimePart.SetContent(Stream stream, Boolean encoded)
11:15:17    at MailClient.Storage.Mail.Data.DbMailRepository.SetPartContent(IMailRepositoryItem item, String name, Stream content, Boolean encoded)
11:15:17    at MailClient.Protocols.Exchange.ExchangeMailSynchronizer.GetItemContentInternal(Folder folder, IMailRepositoryItem item, IStoredMimePart basePart, String partName)
11:15:17    at MailClient.Protocols.Exchange.ExchangeMailSynchronizer.PrefetchItems(Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken) 11:15:17&nbsp; &nbsp; at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass33_0.b__1(WorkerStatus status, CancellationToken cancellationToken1)
11:15:17 at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute(WorkerStatus status)
11:15:17 at MailClient.Commands.Command.Process(WorkerStatus status)
11:15:26 [Exchange Web Services] Uploading item(s) to folder 'CPD/Inbox/'
11:19:06 [Exchange Web Services] Synchronizing folder list

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If you have a Pro License, please open a support ticket with eM Client.