Outlook 2016: Clear the Auto-Complete E-mail Cache

How to Clear Out Individual Entries:

1. In the Outlook main window, start a new email by clicking the New Email button.

the "New Email" button at the top left in Outlook 2016.


2. In the new email To field, start typing the email address or the name of the contact you would like to clear from the Auto-Complete cache. It appears listed in a tool-tip.

3. Press the down arrow key to select the right contact if there are more than one proposed. 

4. Click the delete (X) icon next to the suggestion to permanently remove the Auto-Complete entry.

How to Clear the Whole Auto-Complete Cache:

1. In the Outlook main window, click the File menu.

the "File" tab in the top left of the Outlook 2016 ribbon.


2. From the File menu, click the Options button.

the Options tab on the sidebar


3. In the Options, click the Mail tab and scroll down to the Send Messages section.

In the Mail tab, under Send Messages section, Empty auto complete button is highlighted at the right of the page


4. Click the Empty Auto-Complete List button.

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

the "yes" button in the Auto-Complete pop up window.


Referenced from: Support.office.com