Conditional Access Blocks Downloads of Office 365 Attachments and Documents

 

Azure Conditional Access policies are pretty powerful, especially when applications accommodate their controls. OWA and SharePoint Online can co-operate with conditional access policies to block the ability of Office 365 users to download email attachments and documents. Although not a perfect solution, it's a good start.

https://www.petri.com/conditional-access-blocks-office-365-downloads