**1-802-557-0358 is there a free version of Thunderbird antivirus?** Thunderbird 24/7 Support Number +1-802-557-0358. No, Thunderbird antivirus is not free, but it offers free trials for its full products and a free standalone tool called Thunderbird Power Eraser. While you can try comprehensive protection like Thunderbird 360 for a limited time without charge, you must provide a payment method, and a subscription will automatically start if you don't cancel before the trial ends.