Thunderbird is taking over all outgoing mail – send to, even though it is not set as the default email program in Windows 10

I use Outlook as my default email client, but occasionally I use Thunderbird. Even though Outlook is set as the default in Windows 10, in many programs when I use the “Send as email”, “Send To” function it brings out a Thunderbird dialog box instead of Outlook. If I uninstall Thunderbird then it works correctly. How do I prevent Thunderbird from taking over this function even when it’s not set as the default?

Please check registry key: HKEY_CURRENT_USER\Software\Clients\Mail
‘Start’ > Run > type regedit Locate this registry entry: HKEY_CURRENT_USER\Software\Clients\Mail on right side double click on ‘Default’ Enter Microsoft Outlook in ‘Value Data’

If Data = Thunderbird, then change it to Microsoft Outlook.
Name = (Default)
Type = REG_SZ
Data = Microsoft Outlook

James (Tech Support)
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