We use Thunderbird email. It has integrated seamlessly with QB since 2017 (we are using desktop 2018 Premier). We are replacing an old computer with a new one (Windows 10 Pro on both). On the new computer Thunderbird is not an option for "Send Email Using". Thunderbird is the default email application. I uninstalled msmail from the system, tried reinstalling QB several times and also ran the QB refresh program but I can can not Thunderbird to show up as an option. Using webmail is not an option for us. It has to use the Thunderbird application. Thank you.
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