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Office 365 (Outlook 2013) - Auto-Complete Names and Addresses in the To, Cc, and Bcc Fields
The Auto-Complete List is a feature that displays suggestions for names and e-mail addresses as you begin to type them. These suggestions are possible matches from a list of names and e-mail addresses from the e-mail messages that you have sent. When you first start to use outlook, you will not have any contacts in your Auto-Complete List, but this will fill up over time.