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Exchange System Mailboxes in Individual Message Stores

My question is this:

   When using Exchange 2000 Enterprise, you can setup individual messages stores within
   a Message Store Group. If for the Exchange Server you also have an SMTP connection
   set up for internet, when you create a new Message Store there are 2 entries that are
   created, SMTP (server- ........same number) and SYSTEMMAILBOX (server-...... same number)
   and when I look in AD I see that the SYSTEMMAILBOX has been disabled.

   I presume that is because there is no AD account to match to this new mailbox entry...

  I also guess that the SMTP (server-..... number) is the SMTP Vitual Queue for that specific
  mail store. What is the SYSTEMMAILBOX and the numbers that accompany the entry, these
  look like mail messages and message sizes ?

  What happens if you delete the diabled SYSTEMMALBOX account in active directory?



1 Solution
The SystemMailbox is linked to a disabled user account you can find in AD Users and Computers in the Microsoft Exchange System Objects container.  This mailbox is used to store information for the server such as store-wide events and the mailbox store's global schema. This mailbox is extraordinarily badly documented in the Exchange community.   There is never a reason to access the SystemMailbox without the supervision of PSS.  There is a KB article (253784) which I believe is still available that tells you how to view this mailbox.  But, it is not simple.  The Exchange server should manage this mailbox automatically.
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