I think you will find this operates differently in V78 which is already in the release channel. V78 uses a much later version of the vCard standard that was the case in 68.

I might also point out that unless recent versions of Excel fix it, it creates ASCII

text files, while Thunderbird expects Unicode text files.  So a step is required to open the CSV in notepad and change the exported CSV text format.  Or you can use libreoffice which uses unicode without having to import it.

Thanks Matt. The reason I am using TB v68 is that I have some email accounts on Exchange Server for business so I am using the ExQuilla Exchange addon to access them. Does TB v78 support Exchange Server yet? If yes, I will definitely upgrade.

From the same folks that offer exquilla, and the addon Thunderbird automatically offers when an exchange account is detected by the new account wizard.

https://addons.thunderbird.net/en-US/thunderbird/addon/owl-for-exchange/?src=userprofile

I know the exquilla was originally written by Kent James and he passed it to Beonex when he retired to do good works in the prison system. I do not know what the forward plan is with this, but I really do not see Ben actually maintaining two addons going forward to basically achieve the same thing. However he does say the exquilla does not support V78 see https://www.exquilla.com/ So I suggest you drop him a line and ask where t find the updated addon.