MailStore – “EWS Error Code: ErrorInvalidExchangeImpersonationHeaderData” when archive from Microsoft 365 mailboxes
ID: 13507
Summary
In MailStore, if you’re archiving from Microsoft 365 mailboxes, the following error occurs: “EWS Error Code: ErrorInvalidExchangeImpersonationHeaderData”
This issue was reported in (but may not be limited to):
- MailStore Server
- MailStore SPE
Cause
The impersonation mailbox information has become corrupt, and moving it to a different database triggers a correction.
Resolution
Third-Party Issue
This is a third-party issue and cannot be resolved by MailStore.
If you have issues with a mailbox and want to fix it by moving the mailbox within your Exchange Online organization, lease open a Microsoft Support request.