How can I reactivate OFFICE Professional Plus 2016 back onto my rebuilt windows 10 computer that has no internet access

Vance Johnson 0 Reputation points
2026-09-02T20:42:25.1666667+00:00

I purchased OFFICE Professional Plus 2016 in May 2017. I have my purchase receipt, the supplied DVD, and the 25 character registration code. I installed OFFICE 2016 on my rebuilt computer. Activation over the phone is no longer available for OFFICE 2016. The computer has a LAN connection but I have no LAN internet connection available to me. How can I activate this copy of OFFICE 2016?

Microsoft 365 and Office | Install, redeem, activate | Other | Windows
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  1. Kai-H 26,135 Reputation points Microsoft External Staff Moderator
    2026-09-03T08:23:21.9733333+00:00

    Hi, Vance Johnson

    You can still activate the rebuilt computer without connecting it to the Internet. The automated telephone process was moved online on December 3, 2025, but offline activation remains supported through the Product Activation Portal.

    Open Word or Excel on the offline computer and start the Activation Wizard. Choose I want to activate the software by telephone, select your country, and note the Installation ID displayed in Step 2. The message saying telephone activation is no longer supported can be ignored.

    On a different computer or phone that has Internet access, open the Product Activation Portal and sign in with a Microsoft account. Enter the Installation ID from the offline computer. The portal should provide a Confirmation ID, which you then type into Step 3 of the Activation Wizard on the offline computer.

    If the portal rejects the key or reports too many activations, contact Microsoft Support and provide the purchase receipt and product key. Also confirm that the DVD and key came from an authorized seller, since Professional Plus is commonly supplied through volume licensing.

    Please be advised that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.   

    Thank you for your patience in reading, I hope this information has been helpful to you. 

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