Outlook 2010 AutoComplete
In Outlook Auto-Complete feature will show you suggestions for names and emails as you begin to type in either the To, Cc or Bcc field. If you think that feature annoying, please follow this tutorial to disable it.
1.Launch Microsoft outlook.
2. Go to File > Options.
3. Click on Mail and scroll a bit till send message.
4. Now uncheck the following:- Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines .