"Can't Display Your Message" Error In Outlook Web App

By Ashwin Venugopal -

 








Problem

When a user of Microsoft Exchange Online attempts to open a message encrypted with Microsoft Purview Message Encryption in Outlook Web App, they receive the error message: We cannot display your message at this moment. This problem happens even when user is capable of sending encrypted messages using Outlook Web App. 

Cause

This issue arises due to alterations in the MIME types linked to the default Outlook Web App policy, resulting in the removal or modification of the text/html MIME type. 

Solution

To address this issue, restore the MIME types linked to the default Outlook Web App policy to their original settings. To achieve this, follow these steps:
  1. Connect to Exchange Online via Remote PowerShell.
  2. Run the following commands:
$owapolicy = Get -OwaMailboxPolicy

Set -OwaMailboxPolicy -AllowedMimeTypes @{remove = "text/html"} -BlockedMimeTypes @{remove = "text/html"} -ForcedSaveMimeTypes @{add = "text/html"} -Identity $owapolicy.Identity

Conclusion

The error in which the message is not displayed in Outlook Web App is resolved. 






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