My biggest disappointment with the business version the fact that it is impossible to turn off the pop up notification when somebody logs in or out from Skype. Before you post me URL from the support website, non of them works, everybody in the office (10+ engineers) tried to disable this but no success. The only way you block that is to put yourself into do not disturb mode, but than non of the legitimate notifications are displayed either. Skype for business is a perfect distraction tool without providing any quality or functionality that other software already have. I just do not understand that in 2016 MS is at this level when it comes to user experience after being in the user facing software business over 40 years.