This is an old revision of the document!
https://www.youtube.com/watch?v=3Rjlk5DJUmQ
There are way too many ads in the Microsoft Skype Windows app. Get rid of them like this:
Internet Explorer → Internet Options → Security → Restricted Sites → Add
https://apps.skype.com
Optional?
Tools → Options → Privacy
Deselect “Allow Microsoft Targeted Ads”