Inline drafts Outlook 2013 on Exchange 2007

I'm currently running Outlook 2013 on a Win8 machine against Exchange 2007 as my primary machine. I noticed on a separate machine running Outlook 2013 on a Win8 machine against Office 365 that when replying to a message the draft is saved inline and the

in the message list window it displays the text [DRAFT] on the message. I'm not getting this same function on my primary machine. This is quite helpful when you might have multiple messages you are in the process of replying to. I have found a clear statement

on whether or not this is supported on Exchange 2007. I've read posts where users had this feature when running Outlook beta but it's now been removed. I'm trying to find out if this is something I need to enable some place or if this simply won't work on

Exchange 2007 and if not, then why not if it supposedly worked on earlier releases of Outlook.

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