This is the only Microsoft-endorsed field-proven solution for delivering Skype for Business in a virtualized environment, supporting not just two-way point-to-point calls but also conference calls and Skype Meetings. The primary recommended method for delivering the Microsoft Skype for Business® client from Citrix Virtual Apps and Desktops (formerly known as XenApp and XenDesktop) is HDX RealTime Optimization Pack 2.x, the product of a close collaboration between Citrix and Microsoft to co-develop a new and improved 'v2' delivery architecture for Skype for Business and Citrix customers.