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Using Firefox 21.0. Using a Hotmail account "upgraded" to Outlook. How can I delete an email address that popups in address block but it is not in my contacts

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I use Firefox 21.0 I have a hotmail.com email account. It was "upgraded" to Outlook. I've noted that some email addresses that appear when typing an email address to create a new message are not in my People list. How do I delete email addresses that appear when typing in an address for a new email but that email address is not in my People list?

I use Firefox 21.0 I have a hotmail.com email account. It was "upgraded" to Outlook. I've noted that some email addresses that appear when typing an email address to create a new message are not in my People list. How do I delete email addresses that appear when typing in an address for a new email but that email address is not in my People list?

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(Please update to Firefox 22 Update Firefox to the latest release)

This is an outlook question, not a Firefox one.

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I've noted that some email addresses that appear when typing an email address to create a new message are not in my People list.

Might be appearing as "form history". Try clearing your form and search history.