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. Please verify this in the links provided above.