"Think Google respects your privacy? Think again," the advert says. Before calmly reminding you that Outlook.com won;t go through your emails to sell you ads. Especially after you're cat's just died.
Sadly, tech firms trading insults over marketing and ad material has become all too familiar over the last couple of years. The Samsung "Genius" ad and the BlackBerry "Wake up" campaign are two recent examples.
We've included the videos below, so you can have a watch and make up your own mind about nasty, nasty Google.