Which mail program are you using, outlook? If so which version?
Ok so you are using the edge browser and want to sort your email by "sent to" is that correct? If so let me know who your email provider is.
Sorry, so you are using thunderbird for email correct?
So you do not mean in the actual thunderbird program correct? You mean you have thunderbird data files and you wish to sort them in a windows folder by who you sent email to?
If you are talking about sorting the mail in thunderbird you just need to click on your sent mail folder and then click recipient up at the top and it will sort them by who you sent them to.
Are you able to view the emails in thunderbird? Do you even have thunderbird on the computer? If not you would need to install it and view the mail that way. If you just have the files from an old thunderbird account you can't sort the emails, they need to be sorted in the thunderbird program. Let me know if I am not understanding you correctly but it sounds like you are just talking about the thunderbird folders but not in the actual thunderbird program.
Windows explorer cannot sort the email by recipient. You would need to open the files with thunderbird in order to sort them that way.
The reason is because windows explorer cannot read the mail, thunderbird can. Windows explorer will only be able to sort by date, name, type, size, etc... but it cannot sort by the actual mail contents.
Does that make sense?
I understand, I think what you are wanting to do is just not possible. As I said if you need to sort email that was in thunderbird by recipient you need to open the mail in thunderbird. Windows does not have the ability to do that unfortunately. This site has a 100% satisfaction guarantee meaning if you did not get what you needed you do not have to pay. More information on that is here http://ww2.justanswer.com/help/how-can-i-request-refund-0