> If you don't read all the messages while you're logged on, then you won't get another chance to view them, unless you're a PUTM.
Not quite - you can still see all messages for a specified day. What is disabled for non-PUTM is (among others) a) the Time Warp, b) Search for messages by keyword.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)