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Ubisoft's UPlay service got hacked and the idiots did not have the passwords encrypted. They have sent emails to everyone to reset their passwords (might be in spam)
Go to UBISOFT.COM do not use the email. The chances are high that phishing mails are sent around too and it's always better to be safe then sorry.
Here is the Article: http://www.joystiq.com/2013/07/02/ubisoft-hacked/