The same: Office remained activated for five days, then deactivated.
I tried uninstalling Office and this time re-installing it from my Office 365 Home subscription.
Whatever I did Office was always deactivated after five days. In this real-life example case, I had an interesting issue when setting up Windows 10 from a deployment image with pre-installed but not activated Office installed from my Office 365 for Enterprise subscription. In some cases, this might lead to activation issues when user installs a Click-to-Run Office based on his / her subscription, be it Office 365 Personal, Home, Business or Enterprise. Quite a many computers today with pre-installed Windows come with a trial version of Office.