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In order to use a certificate for authentication with some IMAP clients, you will need to install the Physics root certificate.

Physics Authority Certificate:
        Download root certificate: WU_Physics_CA.crt

Mozilla/Netscape users need to follow these steps:
  1. Click on the Download root certificate: WU_Physics_CA.crt link above.
  2. On the dialog box that appears, check all three boxes:
    • Trust this CA to identify web sites.
    • Trust this CA to identify email users.
    • Trust this CA to identify software developers
  3. Click the "OK" button.

Internet Explorer users on Windows need to follow these steps:
  1. Click on the Download root certificate: WU_Physics_CA.crt link above.
  2. On the dialog box that appears, click on the "Open" button. (Windows XP will save the certificate file to disk first).
  3. Click on the 'Install Certificate...' button in the window that opens.
  4. Accept the Certificate Installation Wizard's defaults.

Mac OSX (10.3 and higher) keychain users follow these steps:
  1. Download the root certificate file by clicking the link above.
  2. Double click on the saved WU_Physics_CA.crt file.
  3. Choose
    4. For OS X 10.4.x (Tiger)
          Select X509 Anchors from the drop down list in the import window
    For OS X 10.5.x (Leopard)
          Select System from the drop down list in the import window
  4. Click on the 'Install Certificate...' button.

Other browsers may require similar but slightly different steps.