HowTo remove names from the "To..." drop down list when emailing?

[Oliver]

How do you remove unwanted email addresses in the drop down window of the
"To..." box when composing an email?

 

[vbasean]

http://ask-leo.com/where_do_outlooks_autocomplete_suggestions_come_from.html

use the up and down arrows when the suggestion is being made and when on the
item you don't want press 'delete'