To perform a letter mail merge in Microsoft Word you need a data source. Excel is a great data source. This covers setting up your letters - Chris Menard
If you put the filename and path in a Word document, when you need to update the file, you know exactly where you saved it.
Need to send emails to a group? Instead of sending to a contact group, you can do a mail merge and personalize each recipient's email.
If you have confidential or sensitive information in your Excel or Word files, you should encrypt your files with a secure password.PowerPoint, excel, word