Users should always double check the email address before agreeing to do what is asked or clicking on any contents attached to the letter. “Microsoft account unusual sign-in activity” scam relies on the credulous people who do not pay attention to details. However, cybercriminals invented a phishing technique to trick novice users into giving their credentials - they sent fake letter that look extremely similar to the legitimate ones. In most cases, such emails are legitimate and useful to protect you from hackers. “Microsoft account unusual sign-in activity” is an email letter which informs about a suspicious sing-in to the Outlook account.
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