If someone calls you from Microsoft tech support to help you fix your computer, mobile phone, or tablet, this is a scam designed to install malicious software on your computer, steal your personal information, or both.
Do not trust unsolicited calls. Do not provide any personal information.
What you need to know about tech support phone scams:
Microsoft will not make unsolicited phone calls about computer security or software fixes. If you receive a call like this one, it’s a scam, and all you need to do is hang up.
Cybercriminals often use publicly available phone directories, so they might know your name and other personal information when they call you. They might even guess what operating system you're using.
If you have already given access to your computer to someone who claimed to be from Microsoft, immediately change your computers password, download the Microsoft Safety Scanner, and then make sure you have antivirus software installed.
If you gave someone your credit card information to pay for services, contact your credit card company and alert them to this fraudulent purchase.
The Federal Trade Commission (FTC) has received reports that criminals are taking advantage of consumers’ knowledge of the scam by calling to offer refunds for phony tech support. This is also a scam.
For more information, see Avoid tech support phone scams.