The Web Application Server is not a true Skype for Business Server 2015 (SFBS 2015) role, but a SharePoint role that SFBS 2015 leverages for its document rendering of Office related applications. The Microsoft Skype team went with a more formidable approach to document rendering in turn is accomplishing several things at the same time with regards to standardizing the way various products present Office based documents to non-standard devices such as tablets, IPhones, MACs, and other mobile devices as well.