How do I create a SSB for Outlook web mail using Fluid?

Has anyone successfully created a fluid app for outlook web mail (aka live mail)? I've tried but either the site opens in my web browser or (after white listing variations of the site url) I get an error message stating that I need to use internet explorer or an updated version of safari. The site opens fine in my firefox web browser (my default browser) so I don't think it's a browser problem.