There are to expiration dates. One for the activation and an other for the "spend". So you could activate it before 30 Jun 2017, but after the activation you have to spend it 90 days. As you wrote you can check it in your account for the exact expiration date, but MS will send you a reminder 1 month before expiration. Anyway the 90 Days is less than the normal, I only got promotional cards with 365 days expiration date after redeem...Apparently not as this is what I got in the email -
Also it says it expires on October 2nd 2016 on my Microsoft account page.
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