Outlook compatibility?

Posted Feb 25, 2010 14:40 UTC (Thu) by NAR (subscriber, #1313)
Parent article: Trustedbird: Additional email security for Thunderbird

How compatible are these extensions with e.g. Outlook? As far as I know, Outlook has some support for encrypted e-mail (at least I've received encrypted e-mails from Outlook). Those RFCs look to be promising in this regard...