Disable Protected View For Outlook Attachments
It’s a helpful security feature, but if you only download documents from trusted sources, this feature is more annoying than helpful. To disable it, open Microsoft Word, Excel, or Powerpoint, etc…and then click File » Options. From the options, menu select Trust Center > Trust Center Settings. Go to the Protected View tab in the trust center and then uncheck the bottom box titled Enable Protected View for Outlook attachments....