Event ID - 9546

Event Id9546
DescriptionFailed to create the Event Registration Mailbox for Database First Storage Group\Private Information Store (servername). Error - 0xbf69
Event InformationAccording to Microsoft:CAUSE:
This behavior can occur when a System mailbox object that is created for this mailbox store exists in the System Objects container. When you try to mount the mailbox store, an Exchange 2000 computer may create another object. Only one System mailbox object can exist for each mailbox store.
To resolve this behavior, delete the System mailbox object that exists:
1. Start the Active Directory Users and Computers snap-in.
2. On the View menu, click Advanced Features.
3. Locate the Microsoft Exchange System Objects container, locate the System mailbox object that was created for the mailbox store that you are trying to mount, and then delete it.
If there are multiple mailbox stores on this Exchange 2000 computer, you see multiple System mailbox objects. To determine which System mailbox objects you need to delete, compare the globally unique identifier (GUID) numbers of each of the System mailboxes on the mailbox stores that are running. To do so, use Exchange System Manager to view a mailbox store that runs under the Mailbox Store\Mailboxes container, locate the System mailbox object, and then record the long string of numbers that follow that are enclosed in parenthesis. After you record the GUID, return to the Active Directory Users and Computers snap-in and match the GUID. After you repeat this process for every mailbox store that is currently running, there is one account left that does not match a mailbox store; delete this account.
Reference LinksMessages Occur When Mailbox Store Fails to Mount

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