While Microsoft does not provide a direct ISO for Exchange Server 2016 via a simple public link (due to licensing and update rollups), the most useful and authoritative paper/documentation for obtaining the media is Microsoft's official "Exchange Server 2016 – Release Notes and System Requirements" and the "Exchange Server 2016 Download and Update Rollup Guide" .
Since support has ended, Microsoft no longer provides security updates or technical assistance for Exchange 2016. To stay secure, organizations are encouraged to: Migrate to Exchange Online: Transition to Microsoft 365 for ongoing support and cloud features. Upgrade to Exchange SE: --- Microsoft Exchange Server 2016 Iso Download
Volume Licensing Service Center (VLSC): For organizations with an active volume license agreement, the Volume Licensing Service Center is the primary portal for downloading the final retail versions of the ISO. While Microsoft does not provide a direct ISO