Do you ever click on 'Reply' and then edit the TO field to send copy of conversation to another person ? Or click on Reply and then clear contents to compose a different conversation because it saves you from having to input email addresses in the TO field. re email you want to reply to... right click on the email in list and select 'Open Message in Conversation' It will open in another tab. check to see if threading shows other emails as part of conversation or is there just the one email ? If you see a small arrow next to the subject then click on it to open the threads. It will show emails received and emails sent by you. what do you see?