Is it possible to have threaded email conversations in Thunderbird just like how it is in Gmail? How can I do that?
Use Thunderbird Conversations. Never look back :-) Threaded view alone was too little for me.
Sort of: View -> sort by -> threaded.
However, if your answer is not in the folder you're viewing, it is not visible in the thread view.
There's also a plug-in called conversations that usually gives you the gmail look (your mail from 'sent' folder is visible in the conversation view -- most of the times ).
It "is" built-in on thunderbird now, if you do the right steps:
There is the "Global Inbox" (if there isn't one, you have to activate it at
View >> Folders >> Unified from this tip)
Go on its properties at "Select the folders to search:"
and click on "Choose...", you will see that your top inbox is checked;
just check the "sent" one, click "ok", and "Update".
Now, go to your top "inbox" that is the global one, activate the threaded column and you have a three with all incoming and outgoing messages!