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17 March 2011, 10:31
Go to http://www.tomtom.com" target="_blank" rel="nofollow and log into your account under the old email address.
Then go to account settings and change the email address there.
If you have LIVE or PLUS services, then afterwards you'll need to also change your account on the Tomtom device to the new email, by going to MyTomtom Account in the device's settings menu.