An odd BlackBerry shortcoming

I'm not sure why I can't easily undelete items on my BlackBerry. Ten minutes after I decide I can wait until I'm at my desk I realize I should have replied before I pressed the delete key.

There's a "deleted items" folder that's always empty, but nothing else apparent in the UI. Perhaps I'm missing something obvious, but I've looked and looked and can't find it.

I don't like the BlackBerry UI at all (though it's better than my old Motorola pager!) but this seems like an odd oversight even for RIM.