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When you start typing in the To, Cc, and Bcc fields in Outlook, you'll see suggestions appear based on what you've entered. Outlook builds the Auto-Complete List by temporarily saving the names and addresses you've previously used when sending messages.
You can clear all entries from the Auto-Complete List by:
- In the Outlook main window, click File.

- From the File menu, click Options.

- In Options, click the Mail tab and scroll down to the Send Messages section.
- Click Empty Auto-Complete List.

- A confirmation box will appear, click Yes. The Auto-Complete cache will be completely erased.
