Fonts from CSS are ingored in Outlook 2007

It seems like Outlook ignores JIRA's CSS in email notifications.

For e.g. CSS define fonts to be Arial, however Outlook ignores that and displays Time New Roman.

and the same message in Thunderbird

It appears that Microsoft has done some serious change in HTML and CSS Rendering Capabilities in Outlook 2007. More on that at http://msdn.microsoft.com/en-us/library/aa338201.aspx

More on that in Nick's comment on the linked issue.
Also, 'there is NO option to switch renderers. In 2003 there is an option to use Word, in 2007 there is NO option to use IE. '

I've attached a raw copy of the test message and its html