OWA in Firefox
Yes it can be done.
Outlook Web Access Premium can't be rendered using the Firefox engine - when you try to login you'll notice that "Use Outlook Web Access Light" is ticked by default (see below)...
Firefox without IE Tab
There is an add-on for Firefox called IE Tab that allows you to have tabs rendered inside Firefox, but actually using IE.
Firefox with IE Tab installed
So although it's not really Firefox doing the rendering - this will allow Firefox users to use OWA Premium without firing up two browsers.
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