Installation of certificate in Thunderbird

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Download the certificate from http://netfree.link/netfree-ca.crt and save it anywhere on the computer.

Tools menu > Options... > Advanced > "Cetificates" Tab > View Cetificates > "Authorities" Tab > Import

In the dialog box, navigate to the location where you saved the certificate, select the certificate, and then click OK. A window will appear, check all checkboxes and confirm.

_{You can add a more detailed guide here. Inspired by this: http://wiki.cacert.org/ThunderBird}