How to delete email address history from Auto-Complete List in Outlook?
Outlook will automatically remember and save the email addresses you typed in the To/Cc/Bcc field, and pop out email address history list when you entering related recipients in future. However, sometimes you want to delete some or all email addresses from the history list. There are two solutions for you:
Delete one email address from Auto-Complete List
If you need to remove just one or several email addresses from the Auto-Complete list in Outlook, please do as follows:
1. Create Home > New Email to create a new email.
2. In the new Message window, please type the first one or several characters of the specified email address in the To/Cc/Bcc field. See screenshot below:
3. Now the email address history list pops out. Please move the mouse over the specified email address you will delete, and then click the Delete button 
to remove it. See screenshot above.
Now the specified email address is removed from the email address list.
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Delete all email addresses from Auto-Complete List
If you need to delete all email addresses from the email address history, you can empty the Auto-Complete List as follows:
1. Click File > Options.
2. In the Outlook Options dialog box, please click Mail in the left bar, and then click the Empty Auto-Complete List button in the Send messages section. See screenshot:
3. In the Microsoft Outlook dialog box, please click the Yes button to go ahead.
4. Click the OK button in the Outlook Options to save the changes.
Now all email addresses history is removed completely, and no email address is reserved in the Auto-Complete List.
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