I know this is kind of "old school" but I like the security of it and haven't found it in the options for Mail. I might just have missed it. I don't want a preview pane and I don't want whatever message I am on to come up in the same area as the list of emails. I want it to come up in it's own window (yes, a pop-up, for those who have been there, think AOL Mail). I do use an email client usually and have this feature enabled by default, but I can't do this from the main area of Hotmail, that I've found.