When I open or forward an email it is pre-populated with web archive file text. Every single time. -0-- MIME-Version: 1.0 Content-Type: multipart/related; boundary-)------NextPart_01030d18.934CFA50" This document is a Web archive file. If you are seeing this message, this means your browser or editor doesn't support Web archive files. For more information on the Web archive format, go to http://officeupdate.microsoft.com/office/webarchive.htm And then it displays the entire HTML code of what should be a blank email. The microsoft article was useless to this particular problem. I can find no similar documentation anywhere online about this problem. To use Thunderbird I have to select all of this code, delete it, and then paste my header, body and signature from another email. This is crazy tedious and totally defeats using TB over Mac Mail.