Windows 10: Activation of preinstalled windows office

I have already preinstalled office 2016. but after full reset of my device I cannot activate my office. I have not any product key in my outlook and gmail. how can I activate office 2016???

:)

 

Windows 10 64 bit OEM, with no Office?

Technically Office is not part of Windows, but many OEM systems with Windows come with Office preinstalled, they generally need to be activated.
If you buy Windows separately, then you have to also buy Office if you want it.

 

Office 2019

Only supported on Win10. Sorry, 8.1 users, only 4 years old, gotta go.

Microsoft Office 2019 will only work on Windows 10

https://blogs.technet.microsoft.com...-to-office-and-windows-servicing-and-support/

Spoiler Office 2019
Last year at Ignite, we announced Office 2019 – the next perpetual version of Office that includes apps (including Word, Excel, PowerPoint, and Outlook, and Skype for Business) and servers (including Exchange, SharePoint, and Skype for Business). Today we’re pleased to share the following updates:

• Office 2019 will ship in H2 of 2018. Previews of the new apps and servers will start shipping in the second quarter of 2018.
• Office 2019 apps will be supported on:
  • Any supported Windows 10 SAC release
  • Windows 10 Enterprise LTSC 2018
  • The next LTSC release of Windows Server
• The Office 2019 client apps will be released with Click-to-Run installation technology only. We will not provide MSI as a deployment methodology for Office 2019 clients. We will continue to provide MSI for Office Server products.

 

MS Office 2007 no more activated...

I contacted a support manager and the situation is:

1. With all my hardware modifications, I reached the limit number of activation (8).
2. Microsoft is no more capable to force a new activation.
3. They suggested me to uninstall and reinstall Office in order to redo an activation.

This last point is not good for me because of the time required, specially with the online updates.
May be, I have only to delete the product key into the registry but Microsoft is not able to confirm.
Do you have an idea before I try to crack it?