Unable to update Mailbox SD in the DS

i get this lovely warning message in the event viewer. I used the ADFind so i can figure out what mailbox it is but it comes up with 0 objects found:

Log Name:      Application
Source:        MSExchangeIS
Date:          5/11/2010 10:29:00 AM
Event ID:      9554
Task Category: General
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      xxxxx.xxx.local
Description:
Unable to update Mailbox SD in the DS. Mailbox Guid: e56bf440-687f-41f6-91ac-a319bb6999b4. Error Code 0x8004010f
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchangeIS" />
    <EventID Qualifiers="32774">9554</EventID>
    <Level>3</Level>
    <Task>6</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-05-11T14:29:00.000000000Z" />
    <EventRecordID>6543</EventRecordID>
    <Channel>Application</Channel>
    <Computer>xxxxx.xxx.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>e56bf440-687f-41f6-91ac-a319bb6999b4</Data>
    <Data>0x8004010f</Data>
  </EventData>
</Event>

Any ideas how i can fix this?