MIAMI (CBSMiami) – The Better Business Bureau warns of crooks who might look to trick you into paying for an “expiring Windows license.”

A person calls pretending to be a Microsoft employee and recommends a system upgrade that requires paying a yearly fee.

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Microsoft says all their support requests start with customers.

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If a claim seems unusual, the BBB says to do your own research before taking any help.

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Microsoft ended its technical support for ‘Windows 7’ last Tuesday.