2.1.1776 Part 4 Section 14.8.3.6, convMailMergeEsc (Treat Backslash Quotation Delimiter as Two Quotation Marks)
a. The standard states that applications shall interpret delimiters composed of a backslash and quotation mark (\") as two quotation marks ("").
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Word interprets delimiters composed of a backslash and quotation mark (\") as a single quotation mark (").
b. The standard does not state any constraints for the usage of this property.
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Word only uses this property in the document that serves as the external data source to be a WordprocessingML document through an ODSO connection.