PH,
The other query:
SELECT DISTINCTROW tbl_Client_Data.Client, Format$([199911].[Date],'yyyy / mm') AS [Billing Month], [199911].Account, [199911].Jobname, [199911].Form, Sum([199911].Impressions) AS [Print Impressions]
FROM 199911, tbl_Client_Data
GROUP BY tbl_Client_Data.Client...