A mail server. --------------------------------------------
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Answer:
Mail merge lets you create a batch of documents that are personalized for each recipient. For example, a form letter might be personalized to address each recipient by name. A data source, like a list, spreadsheet, or database, is associated with the document.
Simply remove the write protected.
Firstly open your Start menu-->
click Run-->
type registry editor-->press enter-->
open registry editor-->
Double tap the Write Protect key-->
right side panel-->
and set the value 0.