Upgrade the Exchange Server Schema to the latest version

Download the latest schema update from the below links:

Exchange Server 2019
Exchange Server 2016

Check the adequate build numbers of effective Cumulative Updates after the upgrade from the below links:

Exchange 2019 Active Directory versions
Exchange 2016 Active Directory versions
Exchange 2013 Active Directory versions

Upgrade steps:

• Copy and paste the latest exchange setup in the Schema Master domain controller.
• Mount the ISO image to the server.
• Open PowerShell as Administrator. Navigate to the DVD disk drive and run the following commands:

Setup.EXE /IAcceptExchangeServerLicenseTerms_DiagnosticDataOFF /PrepareSchema

Force the AD replication - repadmin /syncall /AdePS

Setup.EXE /IAcceptExchangeServerLicenseTerms_DiagnosticDataOFF /PrepareAD /OrganizationName:"MESSAGING"

Note: Change the Organization Name according to your organization. If you are not sure, check with the Exchange Administrator.

Force the AD replication - repadmin /syncall /AdePS

Setup.EXE /IAcceptExchangeServerLicenseTerms_DiagnosticDataOFF /PrepareAllDomains

Force the AD replication - repadmin /syncall /AdePS

Once the Schema has been upgraded, validate the latest version from this script.

Note: The value will depend upon the CU version. Check the same in the links provided above.