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"This will uninstall the existing product key on the KMS host" warning when you try to install an Office 2013 KMS host key
Article ID: 2758428 - View products that this article applies to.
Assume that you run the Volume Activation Tools wizard in order to install a Microsoft Office 2013 Key Management Services (KMS) host key on a computer that is running Microsoft Windows 8. In this situation, you receive the following warning message:
Note The existing Windows KMS host key will not be uninstalled if you click Yes.
You can install multiple KMS host keys of different products on a computer.