Note that Excel in-built stability aspect isn't quite solid and you can very easily open up worksheets/workbooks which were locked. Nevertheless, if you want to quickly shield it just before sending it on your supervisor/customer (so that they don’t turn out transforming something by mistake), it really works perfectly. Microsoft https://www.evernote.com/shard/s394/sh/e8c8d66a-8cf2-b42a-32db-eebaa2791864/5LPhKvW8l2l5XtIHum9DgGqLM_MGmQPPgZR_YdSY3tKp2boSXCvkXc82Ag