Troubleshoot or learn more about if you add an Exchange account that has a security policy which requires a PIN, the Nokia Lumia 710 will force you to provide the PIN (also referred to as a security code) before you can access the Exchange account. If you happen to enter an incorrect PIN for the Exchange account seven times in a row, the phone will initiate a master reset and delete all of your data on the phone. This master reset process and take up to 10-15 minutes and includes an automatic reboot.
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