Outlook stores a copy in sent folder by default. Untick your setting to store message in sent folder and I believe you will see just one copy stored.

Dave, thank you for your reply. I don't have trouble with Microsoft outlook. I have trouble with Thunderbird given me duplicate emails when I was able to connect to Microsoft outlook. I did just what you said and took care of the problem of duplication in Microsoft outlook. What I need to know how to do the same problem with Thunderbird email program which is given me duplicate sent messages.

Joe

I'm confused. You used my suggestion in Microsoft Outlook? Why, since this is a Thunderbird forum. The steps I gave were to fix the problem in Thunderbird. What am I missing? Thanks.

Dave, I did not use your suggestion on Outlook. I knew that I took care that long ago. Forget about Microsoft Outlook expressI should have left that out of the question.

I need to know what Box to tick On Thunderbirds email program so I will stop having duplicate emails in my sent folder. If you can help me with that great.

I don't need no help with Microsoft Outlook express.

Thank you,

OK, now I'm onboard. Go to tools>accountsettings>copies&folders and UNtick the box to save Sent messages.

Dave received your message, When I was checking my messages. Followed your instructions to the T. will let you know Dave as soon as I have to send a message to someone.

I thought that was throwing you off When I put in their Microsoft office.

Greatly appreciate your help and will let you know when I know LOL.

Again, thanks,

Joe

Dave, the problem is solved. Thank you. No more duplicate in the sent Folder.

Again, thank you, Dave

Joe

you're very welcome.