I too was totally clueless about Skype until I got this new laptop where it came as part of the bundled package. I haven't used it but had a look to see what it could do. Not all is free it transpires!
Microsoft's latest acknowledged business challenge is to turn it's Products, from a one off Purchase, to an Income Stream. Skype, although Free to use, will be part of that program.
I would think that Skype will still be free to use, but have Adverts included somewhere in the package, with the proviso that, for a small Premium you can have it Advert Free. This would give M$ a chance to work out what is the most successful method of collecting that Premium.
I believe that later Microsoft Office will become a 'Rentable' Product, although whether it's to be split into its various component parts or Rented in bundles, as it is now Sold, is something I cannot guess.
I have used it for a good few years now to call relo's in Oz. It costs about 20 pence for thirty minutes and of course you have to pay in advance by loading an amount to do so. Calls to other computers are free and calls to a telephone set are cheap as chips. I have never done so as I don't have a camera. (who would want to see my gob?) but I believe you can use the video system too.