My password it used to accept is not accepted anymore

we know exactly what you tell us. If you want anything vaguely useful as an answer I suggest you spend the time to actually describe exactly what is happening and with what mail provider.

You you see error messages, when and what do they say? Verbatim please.

I use Thunderbird on my computer and my laptop. Thunderbird on my computer works fine but on my laptop it will not accept the password for my provider. When I open the email program it asks me for my password for my email on imap.virginmedia.com. I then type in the password . It then comes back that my login failed. I have my wife' email also and this happens just the same. I have triple checked that my virgin media password is correct but I cannot get anywhere. The only way to get out of this cycle is to resort to Task Manager to end the task. Can you help please. Thanks

I use Thunderbird on my computer and my laptop. Thunderbird on my computer works fine but on my laptop it will not accept the password for my provider. When I open the email program it asks me for my password for my email on imap.virginmedia.com. I then type in the password . It then comes back that my login failed. I have my wife' email also and this happens just the same. I have triple checked that my virgin media password is correct but I cannot get anywhere. The only way to get out of this cycle is to resort to Task Manager to end the task. Can you help please. Thanks

It's best form to start a new thread for your issue rather than add so someone else's who may have already resolved their problem long ago. But since you're here..

According to Virgin's email settings page, you need an "app password". This is not the same as your regular password that you would use to log into your online account or web mail. Do you have an app password?

https://www.virginmedia.com/help/broadband/manage-email-settings