MSFT 365 Defender - Email & Collaboration email preview not working

Copper Contributor

Just curious, why the email preview under Email & Collaboration (explorer) is not working any more (All emails) 


It says "Message details couldn't be found. When a message is soft deleted or hard deleted by the user or the admin, its details no longer exist in the mailbox or server"


Is there a setting or permission that changed, as a note doing all this activity as a global admin.


2 Replies

Hey there @dmk199 ! - thanks for reaching out.


There are two things which spring to mind here, firstly, you'll need to have the "Preview" role (permission) - detailed here: The Microsoft Defender for Office 365 email entity page - Office 365 | Microsoft Learn

Also, any messages delivered externally, such as to on premises, will not be able to be previewed, as they do not exist in your Exchange Online instance anymore.






Also seeing this in the last few days. Global admin with Purview permissions too.


The difference is that this tends to happen on emails that are being investigated for phishing so that we can determine if the email is actually a phishing email or the user is being overzealous with the reporting phishing button.


Makes it difficult to investigate if a soft deletion stops it from being previewed. Maybe it's always been like this but it's only in the last few days that it's becoming increasingly noticeable. 


Also note that "Download email" fails on this too. Nothing happens.