You don't have to do anything if you don't want to because you can continue to log in to Portfolio Online using your old email address if you still know your password.
Using an old email address can cause a problem however if you need to reset your password. This is why we recommend you add any new email addresses to your existing account and make your new email address the one you log in with. We call the email address you log in with your primary email address.
If you wish to add a new email address to your existing Portfolio Online account and make it your primary email address, read our article How do I change my Portfolio Online email address?
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