[plt-scheme] sirmail and html mail

Unfortunately because of the company I work at, most of the mails are being sent in html format (the default for Outlook, it seems).

Is there anyway to configure sirmail to read html mails after putting it through a text converter, or browser?

Is there a way to sort by thread?  If not how would I go about creating a way?  I don't know how the threads are identified, so completely in the dark, any advice would be helpful.

Thanks,

rohan