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350HI, we have the following scenario:
* Dynamics 365 OnPremise Version 1612 (8.2.2.112) (DB 8.2.2.112)
* Exchange Online in Office 365 subscription
* Dynamics 365 and Exchange Online integrated using Server Side Sync
* Mail and appointments flow seems to be working fine
A few weeks ago, some mailboxes in Dynamics 365 started to see the following alert in the Dynamics 365 log:
An unknown error occurred while receiving email through one or more mailboxes. The system will try to receive email again later. For more information, open the associated email server profile *****.
Email Server Error Code: Exchange server returned UnknownIncomingEmailIntegrationError -2147220891 exception.
I googled the error and found several references to items with the value 1 in CRMLinkState. Those mailboxes are not using CRM App for Outlook but in any case I used the EWS Editor for Dynamics 365 in order to find such e-mails but there are no any of them in the affected mailboxes. I double checked the e-mail profile and the Tests were performed with no error. I even tried to test and enable the mailboxes again but even though the process finishes successfully, the error is still being logged.
So, what else could be causing this error in those mailboxes. As usual, I will appreciate your guidance.
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