Its 11 years old. Is this a surprise?
By coincidence, my dad was just telling me this week that he'd recently bought a shrink-wrap copy of Office 2010 or 2013, couldn't activate it automatically, and while MS phone support was reluctant to activate it they eventually found some kind of a workaround.
But the thing is: You pay for something, and it works. Then, just 11 years after the sale, the product suddenly stops working, just because someone said so, even though it's still in perfect condition. That's a nope from me. Imagine you buy new shoes, and after a while you suddenly can't put them on anymore. Or an oven doesn't work anymore after just 11 years. With M$ stuff it seems to have become a new "normal"...