Using Thunderbird email client

tamos123​ "reset Virgin Media password can access email through Virgin but not Thunderbird."

When you say "VM password" is that the password you use to access the VM account via the VM website? If so, then that's why it will not work in Thunderbird.

VM now require you to generate a separate VM Mail app password touse in email apps and clients such as Thunderbird.. To do that you:

Sign into the My Virgin Media (MVM) Account for that email account https://www.virginmedia.com/myvmo2 

Then

1. Select Account Settings
2. Select Identity & Security Settings
3. Select Manage your products
4. Select Manage email app password
5. Click on the blue button 'Get New Password' 

You will then need to update/ edit  the email password in Thunderbird's  settings to this new mail app password that you have just generated. 

Apologies if you already know and have done all that but I thought it was worth saying just in case.😉

Coenoby