Install all the updates on AD Server and Exchange Server. Exchange Server Installation must be on seperate server and not on the same server where AD is installed.
RSAT Tools Installation
Install RSAT Tools by running the followwing command in Elevated PS nstance
Install-WindowsFeature RSAT-ADDS

.NET Framework Installation
Install .NET Framework 4.7.2 or Above (For Server 2019)
Microsoft download link HERE
The exchange server version I am installing is Exchange Sever 2019 Commulative Update ^ or commonly known as CU6, which requires .NET Framework 4.8.
Microsoft Download link is HERE
Its important to check what version you are installing and what .NET framework is required for that particular exchange server version.




Install Visual C++ Redistributable Packages for Visual Studio 2013
Microsoft download link HERE




Microsoft Unified Communications Managed API 4.0
Microsoft Download Link HERE





Windows Server 2019 prerequisites for Exchange Server 2019
Run the below commandlet to install Server 2019 prerequisits for the Exchange Server 2019 Installation
Install-WindowsFeature Server-Media-Foundation, NET-Framework-45-Features, RPC-over-HTTP-proxy, RSAT-Clustering, RSAT-Clustering-CmdInterface, RSAT-Clustering-Mgmt, RSAT-Clustering-PowerShell, WAS-Process-Model, Web-Asp-Net45, Web-Basic-Auth, Web-Client-Auth, Web-Digest-Auth, Web-Dir-Browsing, Web-Dyn-Compression, Web-Http-Errors, Web-Http-Logging, Web-Http-Redirect, Web-Http-Tracing, Web-ISAPI-Ext, Web-ISAPI-Filter, Web-Lgcy-Mgmt-Console, Web-Metabase, Web-Mgmt-Console, Web-Mgmt-Service, Web-Net-Ext45, Web-Request-Monitor, Web-Server, Web-Stat-Compression, Web-Static-Content, Web-Windows-Auth, Web-WMI, Windows-Identity-Foundation, RSAT-ADDS



To be continued to part 2…