When you mail merge and send it as an email, Microsoft does not give you an option to attach a file. The “Outlook Mail Merge Attachment” is a small VB script (similar to a Macro) that attaches a separate file to the emails before sending them: https://www.westernsydney.edu.au/tld/home/how_to/how-to_resources/microsoft_word/email_-mail_merge-_with_attachment or http://omma.sourceforge.net.
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[German] Large collection of Outlook Tools and Add-ins, for mails, calendar, contacts, security/virus scanning, and more: outlook-stuff.com/tools.html.
Read MoreA great way to save attachments from multiple selected items in MS Outlook (VBA macro by technet.microsoft.com): https://gallery.technet.microsoft.com/office/Save-attachments-from-5b6bf54b.
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