Microsoft sometimes misses the boat when it comes to product marketing and naming. They've had a few misses - and a few hits, but with their personal digital assistant they nailed it with Cortana. Until shortly before launch, it had a much different name and almost launched as "Louise", while the name is perfectly acceptable for a grandmother, the reality is that it is pretty dated in this day and age. Thankfully Halo fans won out.
The demo is quite old but we had not seen the videos before and though you might enjoy them too, show Louise running on Windows Phone 7. It's quite easy to see the comparisons between Cortana and Louise and shows how far Microsoft has come with its digital assistant.