Comment 129 for bug 369150

I've tweaked the patch a little to get it to compile - ExtractHeaderAddressName no longer takes a charset. And I've gotten rid of the code that handles failing to get the mime converter - if that fails, we've got bigger problems so I just exit early. I'll attach a new patch once I've verified that things basically work.

I can probably construct some test cases from the various comments in the bug, but if anyone has a test case mailbox file already made that they'd like to put in the bug, that would be helpful.