Makes sense to add this. When trying to carry on a conversation through PM it can get a little difficult through the long string of RE:RE:RE:RE: etc. to tell which message you're actually trying to read, and if you need to look back to refresh yourself on something somebody said earlier, it can get even more difficult.
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[color=#282828][font=helvetica, arial, sans-serif]This would get very complicated if your converstions are taking months to complete, since PM's are automatically deleted after a certain period of time.[/font][/color]
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[color=#282828][font=helvetica, arial, sans-serif]Perhaps then it could be done so that if a conversation hasn't had a reply in a certain amount of time, then it gets deleted.[/font][/color]