I really hate seeing things like this, especially misunderstanding/misuse/abuse of copyright law. With respect to the unboxing on Youtube, unless there are images subject to copyright, of which he is claiming ownership in the video, Microsoft has no claim against him. I'm certain that there are Trade Marks on the devices and their packaging; but Trade Mark and Copyright are two completely different concepts and are subject to completely different sets of laws and rules. His unboxing video can show packaging and products with Trade Mark all day long, just so he doesn't attribute that mark to himself. In fact, if any infringement is occuring at all in this interaction (refencing the Youtube unboxing) it's on the part of Microsoft. But between Microsoft's own legal team knowing what they can get away with and Youtube not giving a damn about the individual, he just got a raw deal that he really can't do anything about.
I saw an earlier post that - to paraphrase - he would have been better off if he kept it all to himself rather than going to social media. It's a valid point, and most likely true. However, there was nothing illegal, nothing actionable, on his part. His lawful communications should not be (and legally aren't) subject to the, in this case, abusive scrutiny of Microsoft.