Was it an IMAP or a POP account which you removed? Did you only remove the account information or did you also remove the message data?

That would depend entirely on whether this was a POP or an IMAP account.

If IMAP, everything that was on the server when you deleted the account should still be there and merely setting up the account in Thunderbird again will let you get your data back.

If POP, some of your incoming mail may still be on the server, depending on which were your settings to leave messages there after downloading them, but other than that everything else for which you don't have a backup is gone for good.

You may use webmail to check what's on the server before setting up the account in Thunderbird again.

EDIT: If you deleted the account accidentally, chances are that you only deleted the account info (settings), not the account data (messages and folders), in which case it'll be all still there and you just need to tell Thunderbird where it is located.

Thank you, I have the emails from inbox back but dont know how to get my sub folders back ?