Wer das Client Status Reporting Tool von R2 installiert hat, der ist vielleicht schon auf diesen Fehler im chService.log gestossen:
"Invalid SQL error – Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
The statement has been terminated.
Failed to sync client summary in database"
Der Lösung: http://support.microsoft.com/kb/960634/en-us