How to install a self signed certificate in Windows Vista By Mariette Knap owa, selfsigned certificate vista If you want to use Outlook over the Internet, Outlook Web Access and the Intranet you will need to install the self signed certificate from your SBS 2003 in the Trusted Root Certification Authorities. In Windows XP this was almost a completely automated process but in Windows Vista this is slightly different. In the following article we explain how you do this. Start Internet Explorer and use 'Run as Administrator' from the Start Menu. If the UAC (User Account Control) window pops up click OK. Browse to the Outlook Web Access (OWA) of your company and click on 'Continue to this website (not recommended).' Click on 'Certificate Error' and then click View certificates. If you don't see the option to Install the certificate you must restart Internet Explorer and choose Run as Administrator. Click Install Certificate. Click Next. Click 'Place all certificates in the following store' and click the browse Button. Choose to install the certificate in the Trusted Root Certification Authorities store and clock OK. Click Next. Click Finish Click Yes