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Activate License Key for Exchange 2019 CU15 on Server 2025

In Exchange 2019 CU15 on Server 2025, the license key is displayed as "invalid" in the GUI. However, the key can be successfully entered and activated via PowerShell.

Please use the following download:

DOWNLOAD

1. Requirements

  • Exchange Server 2019 CU15 is installed.

  • Administrative access to the server.

  • A valid license key is available.

2. Enter License via PowerShell

  1. Open Exchange Management Shell as Administrator.

  2. Enter the activation command:

Set-ExchangeServer -Identity "Servername" -ProductKey "Your-License-Key"

  1. Check if the key has been entered correctly:

Get-ExchangeServer | Format-List Name, ProductKey

3. Restart IIS

iisreset

This will update all services and the GUI will correctly display the activation.

4. Verification

  • Open GUI → Server Settings → Check Status.

  • After PowerShell activation and IIS restart, the server should be displayed as activated.

Tip: If the GUI initially shows the key as invalid, do not despair – PowerShell reliably activates the key.

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