I don't understand your question. You are free to put the insertion point ("cursor") wherever you want.

There are settings to control where the cursor is placed for you. Look at

Tools|Account Settings|{select account}|Composition & Addressing.

Hi

I attach a screen-shot of what I mean.

/Jörgen.

What do you want it to do? Replies are "inline" by definition.

The option there for a forwarded message is to send it either inline, i.e. quoted within a new message, or as an attachment to a new message.

The attachment option just doesn't apply to a reply (that would be a "forward") and so all replies are "inline" by default.

You already have what you're asking for, so what different thing are you looking for?

I would like to reply and forward an already opened message without open a "new window". When I used the functionality 'Forward Inline' this happened. I would like to have the same when replying.

I don't understand what you think you have seen.

When you reply or forward, you compose a new message. So it opens in the new message window, which in the current design of Thunderbird is a separate window. It might one day be in a tab (don't hold your breath) but I can't conceive of a workflow where you would reply or forward without wanting the opportunity to add to or edit your outgoing message.

Hence the Write window opens if you reply or forward.

Why is not the original message window closed down when opening a write window. Then you have to close it down separately. Afterwards.

JLin-man said

Why is not the original message window closed down when opening a write window. Then you have to close it down separately. Afterwards.

Because compose in a tab is still on the todo list, where it will stay until we raise a lot of money to completer some of these feature.