Clear Auto-Complete Cache
Go to the File tab and choose Options.
In the Outlook Options dialog box, select the Mail tab.
In the Send messages section, clear the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines.
If you want to clear the auto-complete cache, select Empty Auto-Complete List. In the confirmation dialog box, select Yes.
Clear the cache to remove the auto-complete history without disabling the auto-complete feature in Outlook.
In the Outlook Options dialog box, select OK.
In the Outlook Options dialog box, select the Mail tab.
In the Send messages section, clear the Use Auto-Complete List to suggest names when typing in the To, Cc, and Bcc lines.
If you want to clear the auto-complete cache, select Empty Auto-Complete List. In the confirmation dialog box, select Yes.
Clear the cache to remove the auto-complete history without disabling the auto-complete feature in Outlook.
In the Outlook Options dialog box, select OK.
Updated on: 07/01/2023
Thank you!