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Blocking Dangerous File Attachments in Exchange / Office 365 – Managed IT Services
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Microsoft to block 40+ additional file extensions in Outlook on the web - Help Net Security
Office 365 - Have You Enabled "Common Attachment Blocking"? / Blogs / Perficient
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Blocking Dangerous File Attachments in Exchange / Office 365 – Managed IT Services
Outlook 2013 – How to unblock 'potentially unsafe' attachments – IT Support Guides
