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Hi Robert and Welcome. I'm Joel and I look forward to assisting you today with your question. What error do you receive when you try to open Thunderbird?
Thanks, ***** ***** pop up any errors or notifications at all? Are you running the very latest release?
No worries. That's a bit odd saying you need to purchase Outlook. Did anything else happen on Oct 31, was that when you upgraded to Windows 10? What I would do, is first check and see if there are any Windows Updates that need to be installed, if so install them making sure Windows is up to date. If you have done that and still have no success. I would check the Windows Firewall just incase it is blocking Thunderbird. You can follow the steps here to check and add Thunderbird to the firewall exceptions: Link here. It is for Windows 7 but the steps are similar, basically go into control panel, in the search box type firewall. Then look for Add a program to the windows firewall.
Failing that, we can look at forcing Thunderbird to run in compatibility mode to see if that helps. There is also a Thunderbird safe mode which may get things going although that wouldn't be a permanent solution. Let me know how you go, if you get stuck, we can do a remote session and I can have a look at it for you. I haven't heard anything thus far about Firefox, it should work with Windows 10
You can continue to reply here as your doing, i'll keep getting your replies
Here are the steps for Thunderbird safe mode:
What email accounts do you have in Thunderbird? You have tried removing them and re-adding. If you let me know we could try some basic connectivity tests as well,