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why can't I change the addresses of friends by changing them in my address book?

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In my address book, I changed a friend's E-mail address, but the old address remains in the drop down box where I select the person I am E-mailing. Why doesn't the list when I select 'to" come from my address book?

In my address book, I changed a friend's E-mail address, but the old address remains in the drop down box where I select the person I am E-mailing. Why doesn't the list when I select 'to" come from my address book?

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Is this about Thunderbird or about an internet based email service?

For Firefox you can use these steps to remove saved (form) data from a drop-down list:

  1. click the (empty) input field on the web page to open the drop-down list
  2. highlight an entry in the drop-down list with the mouse or cursor Down key
    do not click the mouse or press the Enter key
  3. press the Delete key (on Mac: Shift+Delete) to delete the highlighted entry