Did you know that there is an easter egg in the windows phone 8.1? Discovered by a WPcentral user, all you have to say “Do you like Clippy” to the Cortana. You will get a reply that says “He taught me how important it is to listen.” Here is the screenshot of it.
It is interesting because this easter egg of windows phone replaces the pulsating circle that depicts the Cortana. The clippy looks modern but it is still a clippy.
So in the back it is still Cortana but its logo has been replaced by Microsoft Office helper that has helped countless people nearly a decade ago.