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Hi there and welcome
This email you received is a scam. This person was not working for Apple and Apple would never email you for this.This is what is known as "phishing" it is can be a very serious problem if you do let them access your computer.Basically what they will do is email a lot of people and say that you have problems and need to up=date.
They then give you a link which infects your devices and is used to obtain your personal details and information
Always remember, no tech support company would email you. Updates are done automatically and you get a message in the device itself about it, never an email
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