Emotet is yet another reminder that people should be highly suspicious of files and links sent in email, particularly if they seems out of context, such as when a friend sends an invoice. People should be doubly suspicious of any Word document that requires macros be enabled before content can be viewed. There is rarely any reason for consumers to use macros, so a good household rule is to never enable them for any reason. A better policy still is to open Word documents in Google Docs, which prevents any malware from getting installed on the local computer.
I never knew that opening a document inprovides a level of protection in regards to email.