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Getting the following error downloading the addressbook with Outlook 2003 and Exchange 2007Task ‘Microsoft Exchange Server’ reported error (0×8004010F) : ‘The operation failed. An object could not be found.’ To debug OAB creation in Exchange 2007 you need to turn up the Eventlogging level for the OABTodo so do the following in Powershell.

Get Current Exchange OAB Eventlogging level.Get-EventLogLevel “MSExchangeSA\OAL Generator” Set-EventLogLevel -Identity “MSExchangeSA\OAL Generator” –Level Expert

Remember to disable the logging when you are finished troubleshooting.

Set-EventLogLevel -Identity “MSExchangeSA\OAL Generator” –Level Lowest

 In the end i found two accounts with invalid smtp addresses which the logs identifed easily.