The header for every queued messages tells de id, size, time elapsed in queue, and links for commands Delete and Deliver Now.

Well, I'm seeing this:
Code:
1KIOXB-0000T4-Ce   0.0K   13h1   Delete   Deliver Now
What's the last "1" in 13h1 for ?? Is it related to the message weighting 0 KB? how can be showing 0 KB? when opening the queued message it almost have 10 KB of data and is being sent to several recipients.