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Apple hard codes the integrations between Mail.app and other Apple apps. It's a proprietary interface and they have not exposed an API for developers to utilize.
I am not overly familiar with Thunderbird, but it is possible to create Stationary in Lotus Notes. More details here. http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp?topic=%2Fcom.ibm.notes85.help.doc%2Fmail_stationery_t.html There is a free version you can play with (mail functionality may not fully work). ...
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