Basics: https://bytesandbones.wordpress.com/2019/09/30/thunderbird-gpo-admx   Via Registry: HKCU\Software\Policies\Mozilla\Thunderbird\Certificates\Install\1 = “mycert.der” or Software\Policies\Mozilla\Thunderbird\Certificates\Install\2 = “\\MYHOST\Users\username\mycert.pem” or Software\Policies\Mozilla\Thunderbird\Certificates\Install\3 = “C:\CERTS\mycert.pem” as REG_EXPAND_SZ. If you define only a file name without a path Thunderbird searches %USERPROFILE%\AppData\Local\Thunderbird\Certificates%USERPROFILE%\AppData\Roaming\Thunderbird\Certificates for your files. Via GPO: Use the user branch. Define full path file location or file names only. If you specify only a file […]