The FBI, Microsoft, and Google Will Never Call Or eMail You
A one-page computer security refresher from the FBI.
https://www.fbi.gov/how-we-can-help-you/safety-resources/scams-and-safety/on-the-internet
Of particular interest is the note in the lower right:
Note: The FBI does not send mass emails to private citizens about cyber scams. If you received an email that claims to be from the FBI Director or other top official, it is most likely a scam.
Replace FBI in that note with ‘Apple’, ‘Dell’, ‘Microsoft’, ‘Google’, etc., and it still holds true. Those companies will never contact you directly via email, browser pop-up, phone, text, carrier pigeon, etc., regarding a security issue. If you think they are contacting you directly with a legitimate communication, they aren’t. Please delete the email, don’t take the phone call, and dismiss the browser popup.