iCloud activation

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I update my ipad 2 to ios7.1 and it required the ID for iCloud activation. When type the ID but the password is not correct maybe someone have change it and I don't no. So I go to forget Apple ID and it appear that they send the link to my email. However when I go to my email, there is no link from apple at all. Now my ipad is stuck here. What can I do? This security make my ipad becoming a stone now. Can anyone help me? I am not trying to steal anyone ipad , I just want my ipad back.

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