Disable Conversation View in Mail

I know how to disable conversation view in Apple Mail. View -> Organize by Conversation.
But I have to do it in every single folder/mailbox I have in Mail.
Is there a way to make NOT organizing by conversation default? I mean that by default this option is unchecked.
Thanks!

 

Well, I found out that I could probably go into
~/Library/Mail/V2/<mailbox>/ and then edit in each .mbox the Info.plist-file. It has the Key "DisplayInThreadedMode" which can be yes or no. It is usually yes, but if I change it to "no" it is like clicking View->Organize by Discussion.

So if there was a tool to go through different folders, open each info.plist file and edit the DisplayInThreadedMode-Key, that would help, but I don't know how to do that/if there exists such a tool.