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This error has been reported as bug in Outlook 2010 and can be safely ignored. If you want to get rid of the error there is an options to set a Registry key on each client.
Outlook 2007
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Options
Outlook 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Options
Outlook 2002
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Options
EnableConflictLogging Wert: 0
0 = Logging deaktivieren (Activate Loging)
1 = Alle Fehler protokollieren (Log all errors) > DEFAULT
2 = Nur kritische Fehler protokollieren (Only log critical)