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The Web Application Server can reside on physical hardware or virtual machine. Note: The Web Application Server requires a dedicated server and shouldn’t be collocated with any other Skype server role. Microsoft recommends to set up a centralized Web App Server farm so all related components can leverage its usages. The Web Application Server (WAC) will be responsible for providing service to the organization, so in the event that a single node is not available services for document rendering still need to take place which in lies resiliency. The Web Application Server will exist within the network and become and additional server outside of the Skype roles that is called upon for services such as Exchange and SQL.
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The Web Application Server will be solely responsible for allowing SFB clients to present PowerPoint presentations to audiences regardless to the device the recipient is using.
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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. 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.
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