If you receive an unexpected support request or offer for help from "Microsoft" its probably a scam. Here is one of the more sophisticated ones, so much so that I cant tell without detailed digging if it is or isn't a scam (well I have a pretty good idea). This content was contained in an attached PDF.
If in doubt don't click, so I have taken my own advice.
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Digitalwelcomemat provides IT consultancy and services for business customers on the NSW Central Coast in Australia.