One way phpBB is better than vBulletin :PYeah, good idea, but I don't think it is possible :-?
lolz yeah. Just delete it on your own :P xDI can't believe it. Some people are actually lazier than me? :o
The delete button does the job good enough IMO.
This isn't a great idea. What if you're keeping a pm which has important stuff and it gets deleted when it gets full. What happened to msn/email/forum post.