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I have a user who has different content in the Outlook inbox and in the OWA inbox. It is not that one is a subset of the other, there is different content. There are two or three messages today that exist in both, otherwise completely different. This situation is the same whether using Outlook in online mode or Exchange Cached mode. There does not seem to be any rhyme or reason as to what goes where. Mimecast is in the mix. If I go to the Mimecast archive, I see all of the messages from both Outlook and OWA. Has anyone seen this before? More importantly, has anyone seen this and fixed it?
TIA
I forgot to mention that I have verified Outlook and OWA are accessing the same Exchange account.
Are you using O365 or on-prem Exchange server? What's your Exchange server and CU version? Does this issue occurs for only one user in your organization?
Where are the emails in question come from, external or internal or a specific sender? Have you verified if the same email have same issue for other users?
Could you please give an example for thr different content you mentioned above? Does the issue related to coding or character？
If you are using on-prem Exchange server, you could enable Pipeline tracing to see what changes have been made to the mail while routing
Is there any update about your issue so far?
An update to this issue. While the same account was being used, there were two mailboxes created, one on-prem and the other in O365. Found this article: https://learn.microsoft.com/en-us/exchange/troubleshoot/user-and-shared-mailboxes/mailbox-exists-exo-onpremises?WT.mc_id=365AdminCSH_SupportCentral
The article focused on saving the O365 mailbox, while I needed to save the on-prem mailbox. The solution was to remove the user's O365 license in AAD. The Office 365 mailbox was deleted automatically and mail flow was returned to normal.
HTH anyone with this issue.