Skype for Business Server 2019 require Windows Server 2016 and SQL 2016 as perquisites. In-place upgrade form Skype for Business 2015 is not possible, and you can only do a site by site migration from Lync 2013 or Skype for Business 2015. Skype for Business 2019 is still available as standard edition version and I will install this version in my lab.   Install Windows perquisites   Run Powershell on the new FE server:   Add-WindowsFeature NET-Framework-Core, RSAT-ADDS, Windows-Identity-Foundation, Web-Server, Web-Static-Content, Web-Default-Doc, Web-Http-Errors, Web-Dir-Browsing, Web-Asp-Net, Web-Net-Ext, Web-ISAPI-Ext, Web-ISAPI-Filter, Web-Http-Logging, Web-Log-Libraries, Web-Request-Monitor, Web-Http-Tracing, Web-Basic-Auth, Web-Windows-Auth, Web-Client-Auth, Web-Filtering, Web-Stat-Compression, Web-Dyn-Compression, NET-WCF-HTTP-Activation45, Web-Asp-Net45, Web-Mgmt-Tools, Web-Scripting-Tools, Web-Mgmt-Compat, Server-Media-Foundation, BITS,Read More →