You will see this message if there is no MailMerge object in the document, and that will happen if Word did not open the data source. At the moment I would say there are two strong possibilities why thiat would happen on some machines and not others: a. http://support.microsoft.com/kb/825765/en-us[^] has been applied on some machines and not others b. Word updates are more up-to-date on some machines than others (a fairly recent security update has altered Word's behaviour when it is opening MailMerge documents).
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