Barcode 2d meet Microsoft Tag
VS
Both of this images represent my vCard – pretty much the same information. In order to read them you would need specialized programs. For the first one I found out that QuickMark v3.6R is a great tool to use (there are other tools out there as well) as for the second one the only possible tool is Microsoft Tag.
There are other differences also in the way the information is stored. The 2d barcode has the information stored in those black dots and the Microsoft Tag is just a graphical representation of an URL in my opinion. I say that because when I scan the Microsoft Tag an internet connection is required in order to retrieve the information from my vCard.
Aside from this, I think I will create a sticker with my barcode 2d for my cars window so when I block somebody in the parking lot they will have a way to find out my phone 
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“Aside from this, I think I will create a sticker with my barcode 2d for my cars window so when I block somebody in the parking lot they will have a way to find out my phone”
How is this any different from just having your phone number displayed on your car window? Its the same thing – a special set of encoded information that tells another person how to get a hold of you?
As for Microsoft Tag itself, this is just another example of how Microsoft refuses to use existing standards that are proven to work just fine and think there’s a need that a proprietary system they create will fulfill. They need to stop doing this crap and just use their power to help leverage already existing “standards” into the spotlight as opposed to creating crap that no one will use and will confuse the masses to the point of forgetting a technology exists.
I agree with you on both your observations. Having a barcode on your window is geeky and you have to like it.