[quote=Doivid]
I may be misreading, but I think if you're able to delete an entire convo (which could be 2+), then that would cause some drama with people.Would it be possible for delete to simply remove it from your inbox, but not the other participant(s)? Or is that what 'leave' already accomplishes?
[/quote]

Leaving removes you from the conversation, but leaves the logs of what part of the convo you were there for in your inbox.

Deleting removes you from the conversation and deletes the logs from your inbox.