How to display the application/rtf part in Thunderbird?

[basinilya]

When I compare the generated .eml file with what Outlook sent to the Internet I see that the .eml file contains the unmodified application/rtf part from the origin .msg file. After importing the message to Thunderbird only the plain text part is shown.

However, if I import the .msg file to Outlook and forward it to the Internet the received mail contains a text/html part and Thunderbird can show the message in its full glory.

I tried to extract the rtf part and convert it with RTF::HTML::Converter, but all the styles are lost. Do you know a better way?