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Hello Xavier DEFAY,
Thanks for reaching out to Microsoft Q&A forum Support.
I understand that you want to transfer your Microsoft Office pack to a new PC after changing devices, but you no longer have access to your product key.
Here are steps to transfer Microsoft Office to a New PC Without a Product Key
- Sign in to Your Microsoft Account
- Go to https://account.microsoft.com/services and sign in with the Microsoft account that was originally used to activate Office.
- Uninstall Office from the Old PC
If possible, uninstall Office from your previous device to avoid license conflicts or activation limits.
- Install Office on the New PC
Once signed in, locate your Office subscription or license and click Install Office. This will download the installer for your new device.
- Automatic Activation
If your license is linked to your Microsoft account (as with Microsoft 365 or Office 2021), Office should activate automatically once installed and signed in on the new PC.
Best wishes,
Maryam | Microsoft Q&A Support Moderator