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Amazon's user accounts have some strange behavior. I have managed to get myself 2 accounts with the same email and different passwords. There is no way to merge these together!

This is the only site I've used where the username doesn't have to be unique!

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There's a reason for this. Amazon started before the widespread availability of free email services and it was quite common for a family to share a single email address from their ISP. They built this feature in to allow for this case.

I knew an engineer who interned at Amazon who's responsibility was to maintain this legacy system as there were still quite a number of active accounts that shared the same email address.

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