Earlier quoted context omitted.
Before smartphones and before cheap GPS, I got spoken turn-by-turn directions while driving from Tellme. 1-800-TELL-ME launched in 1999/2000. You told it your address and the destination address, and it read you the directions one at a time. E.g. after you made the first turn, you'd ask for the next one and it'd tell you. It did not need any GPS this way, it's like talking to someone sitting next to you reading the m…
And did what with it? And why?
Using the interactive phone calls to train their speech recognition systems, so that they could eventually use what they learned to develop things like Google Assistant, Cortana, Windows Voice Recognition, etc.
Tellme was taking 2 billion calls a year when they were acquired. They had all the training data Microsoft could want to compete with Google in that area.