Exchange 2007 Messages Queued for Submission counter

Sean pointed this one out to me, and I can’t see I had noticed this before.  Check out in perfmon, on an Exchange 2007 Mailbox Role server:

MSExchangeIS MailboxMessages Queued for Submission and then select _Total or a mailbox database.

perfmon says “Messages Queued For Submission is the current number of submitted messages which are not yet processed by transport.”

It would seem that this counter starts to climb, and never goes down :-| anyone else noticed this? … and there is nothing pending

I know that it’s not fixed in Exchange 2007 Service Pack 1, Rollup 3!