MailStore – “EWS Error Code: ErrorMessageSizeExceeded” when archive email from a Microsoft Exchange Server or Microsoft 365
Summary
In MailStore, if you archive from a Microsoft Exchange Server or Microsoft 365, the following error occurs: “Microsoft Exchange Server was unable to complete the task. Details: The message exceeds the maximum supported size. EWS Error Code: ErrorMessageSizeExceeded.”
This issue was reported in (but may not be limited to):
- MailStore Server
- MailStore SPE
Cause
The size of messages that can be retrieved by MailStore Server through the Exchange Web Services (EWS) is limited by the Exchange Server.
Resolution
Third-Party Issue
This is a third-party issue and cannot be resolved by MailStore. If the Exchange Server’s configuration has to be adapted accordingly, you can use the following article:
https://learn.microsoft.com/en-us/exchange/architecture/client-access/client-message-size-limits
Please note: These limits also apply to Microsoft 365 but are managed by Microsoft and cannot be changed.