I had a message that there was a new version of Thunderbird. I foolishly downloaded it and it installed. Now, some of my configuration has been F****D up. I only use Thunderbird for Usenet access and before the upgrade all unread messages were highlighted in red (including any collapsed threaded folder containing an unread message). Now the only indication is that they are in bold. So far I've yet to find any setting or anything in the help pages that allows the setting to be changed for coloured text.
Can anyone suggest where a change of coloured text can be implemented.