Mount the downloaded ISO, open a Command Prompt as an administrator, navigate to the mounted drive letter, and execute the schema extension:

Select (if you have already sourced the latest CU ISO).

To download the 64-bit ISO file for Microsoft Exchange Server 2016, follow these steps:

As of April 2026, has officially reached its End of Life (EOL) . Support for this version ended on October 14, 2025, meaning it no longer receives regular public security updates or bug fixes. Official Download Information

Microsoft has addressed several issues in Exchange Server 2016, including:

Install the latest "fixed" security updates via Windows Update or manual download.

Setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms Setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms Setup.exe /PrepareAllDomains /IAcceptExchangeServerLicenseTerms

If you are setting up a new on-premises environment or recovering a failed server, you might be searching for the that includes the latest fixes.

Install-WindowsFeature NET-Framework-45-Features, Server-Media-Foundation, 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-Digest-Auth, Web-Dir-Browsing, 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 Use code with caution. 2. Install Third-Party Software