How to transfer SSL certificates between IIS6

Export the server certificate

1. Run MMC
2. Add "Certificates" snap-in for "Computer Account"
3. Select "Local Computer".
4. Close add snap-in dialogs.
5. Open Certificates tree to Personal>Certificates.
6. Right-click on certificate to be exported and select "All tasks", "Export".
7. Specify "Yes" to export the private key.
8. Include all certificates in the certification path and click "Next".
9. Create a password and click "Next".
10. Save, next, then Finish.

Import certificate and private key server

1. Run MMC
2. Add "Certificates" snap-in for "Computer Account"
3. Select "Local Computer".
4. Close add snap-in dialogs.
5. Open Certificates tree to Personal>Certificates.
6. Right-click on >Certificates and select "All Tasks", "Import".
7. Select PFX file you created in previous section and be sure to "Mark this key as exportable".
8. Enter password created in previous section.
9. Confirm that "Personal" is selected as the Certificate Store and click Next.
10. Click Finish to complete.

Assign certificate to website

1. Open Internet Service Manager.
2. Right-click on website you want to install SSL cert.
3. Right-click website and select "Properties".
4. Select "Directory Security" tab.
5. Select "Server Certificate", then Next.
6. Select "Assign an existing certificate", then Next.
7. Highlight imported server certificate.
8. Assign SSL port, then Next.
9. Review summary of changes, then click Next and Finish.

Reference: http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/2cfeeba2-511f-47e8-913c-f196b74e6a44.mspx?pf=true