An IE11 preview bust.  With IE11, OWA wont allow the full OWA experience since it does not "recognize" the browser.

Is Windows 8.1 Preview ready for everyone to try?        

"We strongly recommend that only experienced PC users download Windows 8.1 Preview or Windows RT 8.1 Preview. Before you download  the preview, you should weigh the pros and cons of  installing software that's still in development. If you install the preview release, you'll get to try out the many new features, but you might also encounter errors that you wouldn't encounter using a released version of Windows."

Ref:  Windows 8.1 Preview: FAQ

You are funny Carey. 

I am just posting to let MSFT (who obviously don't check these forums) about some possible issues with 8.1 in the preview stage.  Is this not what the "preview" is for?  So that experienced (I am probably way more experienced that you would like to believe) users can help MSFT identify issues?  That is, unless MSFT really does not want our input--which is fine too.

Still, that is a good feedback: Blame the user.

EDIT: How about that?  On Update Tuesday, an update for IE11 dealing with . . . OWA.

One would think you would be rather pleased that MSFT released an update that addressed your issue within a few hours of your posted concern...