A mail-merge in Microsoft documents can be an intricate undertaking. Data from one source must be merged precisely with the other in order to form letters or create labels for each data entry. While they ultimately save users a lot of time on their mail-outs the process can be tricky and it sometimes pays to add an invisible digital signature to your work. This will protect it from being edited by anyone reviewing the template and determine the origin and authenticity of the document. This process applies to both Microsoft Word documents and Microsoft Excel workbooks. Writer Bio
