Q: if Journal mailbox is full, how ?
A: cann’t be journalled, but the sender does not recievie any NDR,etc because it is sent by the Exchange system itself.
Q: if the journal mailbox ID is disabled, how?
A: still working, no any issue
Q: what kind of message will be journalled ? how about calendar, tasks, etc ?
Thoughts on What is Journaled and What is not in Exchange 2003/2007/2010