Conditional Access Block Download Attachment

Question

Hello , I trying for a few days to enable correct a Conditional Access Policy that blocks attachments to download.

I managed to block attachment in owa but still have the option to save it to one drive.

In windows i have the option to save it locally or in OneDrive. In mobile app i have the option to save it to device.

The conditional access policy

Answer 1

Hello in mobile devices and outlook in windows still cannot block attachment only.
I created an access and session policy just to be sure but with the same results

Answer 2

@Evangelos Rizos

If so, why not use transport rule to block email which contains attachment directly:

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Answer 3

Yes but the user hasn't the opportunity to view the attachment. I want the users to preview their files but not download them from anywhere.

Answer 4

Hello I created a ticket in Microsoft. They told me that in outlook windows application cannot be managed via cloud service the only thing it can be done is from registry to block attachments. So for the Outlook mobile does not use ActiveSync anymore and many of the restrictions doesn't work.