Good morning everyone, hope someone can give me a hand with this problem.
We recently upgraded from CRM 2013 to CRM 2016 Version 1612 (8.2.0.749) (DB 8.2.0.749) on-premises with Server-Side Synchronization. We have an issue with half of our mailboxes which are "with continuous errors and in need of attention"; the other mailboxes are healthy and running.
When I download the Mailbox Details file of one of the troubled mailboxes, it shows the following Unhandled Exception:
> Microsoft.Exchange.WebServices.Data.ServiceResponseException: The specified time zone isn't valid.
Server stack trace: at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ProcessWebException(WebException webException) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request) at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute() at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalCreateItems(IEnumerable`1 items, FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode, ServiceErrorHandling errorHandling) at Microsoft.Exchange.WebServices.Data.ExchangeService.CreateItems(IEnumerable`1 items, FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitations...
lastsyncerrorcode : 104
The lastsyncerrorcode relates to mailboxes having an issue synchronizing Accounts, Contacts and Tasks, even though the mailboxes synchronize correctly for Incoming and Outgoing mail.
When I look into the Mailboxes table in SQL Server, the ones having trouble have a wrong TimeZoneRuleVersionNumber value.
Where does CRM get this value? Why some mailboxes work properly and some don't?
I have tried changing the ACT Synchronization Method to None and back to Server-Side and running the test again, which "fixes" the mailbox for a couple of minutes but then goes back to error.
Any help is appreciated.
