System Attendant missing permissions to it's own mailbox?

Hi

I have enabled mailbox access logging in Exchange 2007. After that I stumbled upon this event (represented multiple times):

Log Name:      Application
Source:        MSExchangeIS Mailbox Store
Date:          25-03-2010 10:40:47
Event ID:      1029
Task Category: Access Control
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      <CCR Node 1 name>
Description:
<CMS_name>-SA@<DNS_domain_name> failed an operation because the user did not have the following access rights:

'Delete' 'Read Property' 'Write Property' 'Create Message' 'View Item' 'Create Subfolder' 'Write Security Descriptor' 'Write Owner' 'Read Security Descriptor' 'Contact'

The distinguished name of the owning mailbox is /O=<Exchange_org>/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=CONFIGURATION/CN=SERVERS/CN=<CMS_name>/CN=MICROSOFT SYSTEM ATTENDANT. The folder ID is in the data section of this event.
________

I don't know if the object <CMS_name>-SA@<DNS_domain_name> refer to a System Attendant account created by Exchange or the CMS' system (computer) account (normally this would be refered as <CMS_name>$).

I have search the AD domain for the object, but without luck. Maybe the object is hidden from normal LDAP searches (samaccountmame=<CMS_name>-SA@<DNS_domain_name>). I can't grant permissions to objects which I can't find.

I haven't noticed any issues which I could relate to these events.

Have anyone else seen this warning before?

Thanks
MichaelVorbeckAsked:
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BusbarSolutions ArchitectCommented:
please run setup and run forestprep and domainprep, domainprep should do it by itself so you might to try it by itself
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MichaelVorbeckAuthor Commented:
Since this is logged for only a server or a service account for the server, I cannot see how forest- and domainprep should resolve this issue.
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BusbarSolutions ArchitectCommented:
because forestprep and domainprep will restore permissions or the Exchange server
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