[MlMt] Open email independently?

[Annamarie]

Good morning,

I fear this is a really stupid question.  I think when I first 
downloaded MM two days ago it was possible to double click on an email 
and have it open in it's dialogue box (if this is the way to describe 
it), rather than in the preview pane. now when I double click it treats 
it as a search. ? Sometimes I like having an email in it's own box.

What have I turned on? What should I turn off? I've spent a little too 
long looking for the answer.

Thanks,
Annamarie