Exchange/Office 365 Calendar Sync issue (Macos 10.15.1)

Email, Tasks sync OK but the eM Client Calendar does not on both Mac and windows eM client versions

Calendar syncing is fine on both version of Outlook for Mac and Thunderbird + OWL for Mac

Using Exchange/Office 365.  Log file as follows:

2:20:22 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder list
2:20:22 pm me@uni.edu.au [Offline Address Book]  Synchronizing folder list
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/Inbox/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/Clutter/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/_ReadSoon/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/_ThePast/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/Sent/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/Outbox/’
2:20:23 pm me@uni.edu.au [Exchange Web Services]  Synchronizing folder ‘me@uni.edu.au/Calendar/’
2:20:23 pm me@uni.edu.au [Offline Address Book]  Synchronizing folder ‘me@uni.edu.au/Offline Global Address List/’
2:20:24
pm me@uni.edu.au [Exchange Web Services]  MailClient.Accounts.ConnectionException: The DateStart property must come before the DateEnd property.
2:20:24 pm Parameter name: dateStart —> System.ArgumentException: The DateStart property must come before the DateEnd property.
2:20:24 pm Parameter name: dateStart
2:20:24 pm   at System.TimeZoneInfo+AdjustmentRule.ValidateAdjustmentRule (System.DateTime dateStart, System.DateTime dateEnd, System.TimeSpan daylightDelta, System.TimeZoneInfo+TransitionTime daylightTransitionStart, System.TimeZoneInfo+TransitionTime daylightTransitionEnd) [0x0006f] in :0
2:20:24 pm at System.TimeZoneInfo+AdjustmentRule.CreateAdjustmentRule (System.DateTime dateStart, System.DateTime dateEnd, System.TimeSpan daylightDelta, System.TimeZoneInfo+TransitionTime daylightTransitionStart, System.TimeZoneInfo+TransitionTime daylightTransitionEnd) [0x00000] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.TimeZoneTransitionGroup.CreateAdjustmentRule (System.DateTime startDate, System.DateTime endDate) [0x0003a] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.TimeZoneDefinition.ToTimeZoneInfo () [0x00097] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.TimeZonePropertyDefinition.LoadPropertyValueFromXml (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader, Microsoft.Exchange.WebServices.Data.PropertyBag propertyBag) [0x0002e] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.PropertyBag.LoadFromXml (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader, System.Boolean clear, Microsoft.Exchange.WebServices.Data.PropertySet requestedPropertySet, System.Boolean onlySummaryPropertiesRequested) [0x00048] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.ServiceObject.LoadFromXml (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader, System.Boolean clearPropertyBag, Microsoft.Exchange.WebServices.Data.PropertySet requestedPropertySet, System.Boolean summaryPropertiesOnly) [0x00006] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader.ReadServiceObjectsCollectionFromXml[TServiceObject] (Microsoft.Exchange.WebServices.Data.XmlNamespace collectionXmlNamespace, System.String collectionXmlElementName, Microsoft.Exchange.WebServices.Data.GetObjectInstanceDelegate1[T] getObjectInstanceDelegate, System.Boolean clearPropertyBag, Microsoft.Exchange.WebServices.Data.PropertySet requestedPropertySet, System.Boolean summaryPropertiesOnly) [0x00096] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader.ReadServiceObjectsCollectionFromXml[TServiceObject] (System.String collectionXmlElementName, Microsoft.Exchange.WebServices.Data.GetObjectInstanceDelegate1[T] getObjectInstanceDelegate, System.Boolean clearPropertyBag, Microsoft.Exchange.WebServices.Data.PropertySet requestedPropertySet, System.Boolean summaryPropertiesOnly) [0x00000] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.GetItemResponse.ReadElementsFromXml (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader) [0x00007] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.ServiceResponse.LoadFromXml (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader, System.String xmlElementName) [0x00091] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1[TResponse].ParseResponse (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader reader) [0x00045] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ReadResponse (Microsoft.Exchange.WebServices.Data.EwsServiceXmlReader ewsXmlReader) [0x00033] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponseXml (System.IO.Stream responseStream) [0x0000d] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.ReadResponse (Microsoft.Exchange.WebServices.Data.IEwsHttpWebResponse response) [0x0005a] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.SimpleServiceRequestBase.InternalExecute () [0x00009] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest1[TResponse].Execute () [0x00000] in :0
2:20:24 pm at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalLoadPropertiesForItems (System.Collections.Generic.IEnumerable1[T] items, Microsoft.Exchange.WebServices.Data.PropertySet propertySet, Microsoft.Exchange.WebServices.Data.ServiceErrorHandling errorHandling) [0x0001a] in <f9beb70d67d34c83aa7e0b21a8630727c>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at Microsoft.Exchange.WebServices.Data.ExchangeService.LoadPropertiesForItems (System.Collections.Generic.IEnumerable1[T] items, Microsoft.Exchange.WebServices.Data.PropertySet propertySet) [0x00016] in :0
2:20:24 pm at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2+<changestoitems>d__18[TItem,TStorageItem].MoveNext () [0x002ce] in &lt;84a12a6f598a461499e0c1741cd38ac2&gt;:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at System.Collections.Generic.LargeArrayBuilder1[T].AddRange (System.Collections.Generic.IEnumerable1[T] items) [0x0003d] in <f818c50c784c4a53bfa161f011633a093>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at System.Collections.Generic.SparseArrayBuilder1[T].AddRange (System.Collections.Generic.IEnumerable1[T] items) [0x00000] in <f818c50c784c4a53bfa161f011633a093>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at System.Collections.Generic.SparseArrayBuilder1[T].ReserveOrAdd (System.Collections.Generic.IEnumerable1[T] items) [0x00017] in <f818c50c784c4a53bfa161f011633a093>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at System.Linq.Enumerable+SelectManySingleSelectorIterator2[TSource,TResult].ToArray () [0x00037] in :0
2:20:24 pm at System.Linq.Enumerable.ToArray[TSource] (System.Collections.Generic.IEnumerable1[T] source) [0x0001f] in <f818c50c784c4a53bfa161f011633a093>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at MailClient.Protocols.Common.ScheduleItemSynchronizeContext1[TItem].StoreItems (MailClient.Protocols.Common.SynchronizationType type, System.Collections.Generic.IEnumerable1[T] newItems) [0x0000d] in <d48749e91f51478dad3c7474de657283>:0 <br alt="" name="" rel="" target="" title="" type="" value="">2:20:24 pm at MailClient.Protocols.Common.ItemSynchronizeContext2[TItem,TStorageItem].Synchronize[T] (MailClient.Protocols.Common.SynchronizationType synchronizationType, System.Collections.Generic.IEnumerable1[T] items, System.Func2[T,TResult] getUniqueId, System.Func3[T1,T2,TResult] hasChanged, System.Func2[T,TResult] isDeleted, System.Func2[T,TResult] convertItems, System.Action2[T1,T2] updateItem) [0x00366] in :0
2:20:24 pm at MailClient.Protocols.Exchange.ExchangeItemSynchronizer2[TItem,TStorageItem].Synchronize (MailClient.Protocols.Common.IItemSynchronizeContext1[TItem] synchronizeContext, MailClient.Storage.Application.Folder folder, System.Threading.CancellationToken cancellationToken) [0x000d8] in <84a12a6f598a461499e0c1741cd38ac2>:0
2:20:24 pm at MailClient.Protocols.Common.ItemSynchronizer`2+<>c__DisplayClass32_0[TItem,TStorageItem].b__2 (MailClient.Commands.WorkerStatus status, System.Threading.CancellationToken cancellationToken) [0x000de] in :0
2:20:24 pm at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute (MailClient.Commands.WorkerStatus status) [0x0001b] in <84a12a6f598a461499e0c1741cd38ac2>:0
2:20:24 pm — End of inner exception stack trace —
2:20:24 pm at MailClient.Protocols.Exchange.ExchangeGenericCommand.Execute (MailClient.Commands.WorkerStatus status) [0x003e2] in <84a12a6f598a461499e0c1741cd38ac2>:0
2:20:24 pm at MailClient.Commands.Command.Process (MailClient.Commands.WorkerStatus status) [0x00012] in :0
------ End Log ----

In the error you have given (just looked at the first few lines) it looks like there is some issue with the start and end date, so it cannot sync that event.

As a Pro Licence user, please open a support ticket directly with eM Client. They will be able to interpret the error and assist you further.

Hello,

Is there any update on this thread? I am trying emClient in order to decide about moving or not moving to this app, and I am facing the exact same issue.

Thanks! =)