This is an old revision of the document!
http://superuser.com/questions/547807/how-to-disable-the-skype-ads-advertisement
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”