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"Exchange.server returned 203 error" appears in Dynamics 365 mailbox alert


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Symptom

When viewing the Alerts section of a mailbox record in Dynamics 365, you see the following warning alert:

"Appointments, contacts, and tasks for the mailbox [Mailbox Name] couldn't be synchronized. The owner of the associated email server profile [Profile Name] has been notified. The system will try again later.

Email Server Error Code: Exchange.server returned 203 error."

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Cause

This message can normally be ignored and does not impact synchronization. Microsoft is working on a fix to make this warning less likely to appear. There are still some scenarios were this may appear. One example is when a non-organizer is trying to update required attendees on an appointment. 

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Resolution

If this warning appears but you are not seeing any issues with synchronization, this warning can normally be ignored. As mentioned in the Cause section, Microsoft is working on a fix to reduce how often this appears and it should not impact synchronization. 

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Keywords: 203, Exchange, mailbox, Dynamics 365, appointment, synchronized, Email Server Error Code, error

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Article Info
Article ID : 4504933
Revision : 2
Created on : 5/16/2019
Published on : 5/16/2019
Exists online : False
Views : 228