As folks migrate to Exchange 2013 and use the in-place archive (aka online archive) using a supported version of Outlook (which I find a bit confusing as to which versions are able to view in-place archive), so people may reluctantly allow old email to be moved to the in-place archive.
They will ask if when they search for key words and select "all mailboxes", does the search also search the in-place archive?
john11