Activating Window product key offline

Jason 0 Reputation points
2026-08-27T05:23:56.2+00:00

Hello,

I found out that I can no more activate Windows product key offline by using phone call (ARS) but only by Microsoft Support Activation Portal.

However, I'm currently trying to activate Windows for the computer placed at customer's site and it cannot be connected to internet and has no Microsoft account. So I was trying to do it by phone call (using install ID and confirmation ID).

Windows version is 2008 R2 version.

How can I activate Windows offline without the Microsoft account log in?

Windows for home | Previous Windows versions | Licensing and activation
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  1. Zoha Fatima 510 Reputation points
    2026-08-27T14:54:35.7766667+00:00

    Hi Jason,

    The offline computer does not need internet access or a Microsoft account. You can complete the activation from a separate internet-connected device; the account used for the Product Activation Portal is not added to the server.

    On Windows Server 2008 R2, open Command Prompt as administrator and run:

    slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
slmgr.vbs /dti

    Enter the displayed Installation ID into the portal from another device. When it provides the Confirmation ID, return to the offline server and run:

    slmgr.vbs /atp <Confirmation-ID>
slmgr.vbs /dlv

    This requires a valid Retail or MAK key. If it is a KMS key, the server must connect to your organisation’s KMS host instead. If portal sign-in is prohibited entirely, contact Microsoft Volume Licensing Support; there is no longer an anonymous offline activation route.

    Please also note that Windows Server 2008 R2 is out of support and should be upgraded where possible.

    Thank you, and feel free to respond back for more assistance.

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