I think you have to have made the accounts in that time frame AND kept a sub the entire time. I made two accounts on day one and have not received the email. But i have taken breaks throughout the years.
This is what blizzard posted:
Criteria required to receive the gift:
Started playing WoW within 60 days of the game launch in your region
A continuous subscription for all 10 years, from launch to the Anniversary
Everything that is fun in life is either bad for your health, immoral or illegal!
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