Update OWA vDir Web.Config across multiple Exchange Servers

This scripts checks multiple Exchange Server 2013 OWA web.config files for existence of IMCertificateThumbprint and IMServerName Xml nodes required for Skype for Business OWA integration.
This scripts checks multiple Exchange Server 2013 OWA web.config files for existence of IMCertificateThumbprint and IMServerName Xml nodes required for Skype for Business OWA integration.