The only setting I know of, is
Tools - Options - Advanced - Maintenance
[ ] Empty messages from the "Deleted Items" folder on exit
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http://get.live.com/wlmail/overview
"John" <me@myhome.net> wrote in message
news:uHRklApZIHA.4028@TK2MSFTNGP06.phx.gbl...
> For some strange reason it seems Vista (Business) mail is emptying my
> Deleted Items folder after a day. I can't see where this setting might
> be... not in Options that I can find. Any idea how to stop the unwanted
> emptying of my Deleted Items folder?
>