WARNING: If you have used S/MIME for email encryption, you should export certificates, in order to retain a backup copy, before deleting them from the browser.
How can I tell if I've used S/MIME for email encryption?.
- In Internet Explorer, follow the menu path: Tools > Internet Options.
- In the Internet Options window, select the Content tab.
- Click Certificates.
- Select the Personal tab.
Select any duplicate or expired certificates and click Remove.
- When prompted to confirm the deletion, click Yes.