Skype was once one of the most popular if not the most popular calling service on the internet. Things changed when Microsoft acquired them for $8.5B in 2011 and then proceeded to make Skype a business product
that they now bundle with Office 365 and try to steal customers from Cisco. Many former users of Skype just don't like how it works, looks, or performs. So now that's it's all said and done Skype just isn't that attractive to the masses anymore and once loyal users are finding better options. This is just one more case of Microsoft grabbing up a good product and then putting the Microsoft stink all over it. Maybe it will regain acceptance or maybe it won't, however, only time will tell if this once ubiquitous product makes a big comeback.