Tag is the first application that Microsoft has made for Android phones. As of this writing, Microsoft Tag was already available for download on Market. Tag is already available on Windows Phones, Symbian, iPhone and Blackberry.
What is Tag? Basically, Tag turns your Android phone into a barcode reader using the built-in camera. The barcodes can then link people to websites where they get discounts or simple information.
If you have a need for Microsoft Tag, search the Market for "Microsoft Tag".