When you receive an email (particularly in Outlook) with an attachment, if the the attached document is a word document, Excel spreadsheet or PowerPoint Presentation, you will often get a message about it being in protected view.
This is a security feature as attachments could contain viruses or other nasty things.
If you use a mouse you can click on a button on the bar underneath the Ribbon. However you can use a keystroke sequence instead.
The sequence is:
- Alt + F, then I then E.
The full details if it helps to remember the sequence.
- Alt + F (for file menu) then
- I ( for info) then
- E (for enable editing)