See: How to use the Mail Merge feature in Word to create and to print form letters that use the data from an Excel worksheet

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

It seems that you don't understand my problem. I know how to do mail merge in Word. The problem is that you cannot use templates in plain text format in Word. They must be .DOCX or .DOTX. Since I cannot convert them to Word I am looking for a service or a tool that can do mail merge with plain text templates.