Is this a valid concern? Absolutely. Microsoft is clearly desperate to migrate XP users to newer operating systems. Not just for the new revenue, though; unpatched, millions of PCs can become prime candidates to host botnet and otherwise disrupt the modern PC ecosystem. And as threats in the last few years have shifted - there are fewer viruses and more phishing attacks, for example - XP will be similarly ill-equipped to handle similar evolutions in the nature of hacker and criminal attacks.
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