Skype for Business: A quick introduction

I cant understand why people use skype for bussiness at this point, its over priced and you got many other applications wich you can use to get the same results

Are you able to call people on normal skype from this?

Very forced sing-song voice - better to present in a normal voice

Does the other user have to also have Skype Business?

Thanks for sharing! Skype is very useful, especially in the business world.

Hope you are including also Linux version of Skype for Business. Else what is purpose of this IM, if it's not even avaliable on all platforms with all features? huh?