How to show sent mail in Thunderbird threaded conversation

By Tze Yong Koh Sunday, October 11, 2015
To see our sent mail in threaded conversation view in Thunderbird, we have to first enable unified view for folders.

After the unified inbox appear, right click on it and select "properties"
Click "Choose" to select the sent folder from the mail accounts that you want to have the sent mail appear in threaded view.

Reference:
http://superuser.com/questions/67488/can-mozilla-thunderbird-show-sent-replies-in-threaded-view

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