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Even nicer: Office 2016 telling you that the launched product (Word, Excel, PowerPoint) has not been activated for your account, and that you need to reactivate your Office. This has at least happened in the first official builds.
Of course this will only happen when you are really, really, in a hurry. Obviously Office has some sensors to control your pulse and your blood pressure, just to drive you crazy.
So be aware of your password (this activation GUI does not remember it).
I think this all is organised a little better in Office 365.
Always wanted to start the day with a positive remark about Microsoft.
No, this is – in my case – about Office 365 ...