This blog post demonstrates how to use Microsoft Excel's Visual Basic for Applications (VBA) to send SMS messages using the Vonage SMS API. The process involves creating a spreadsheet with the cell phone numbers and text to be sent, enabling developer mode in Excel, adding a reference to the Microsoft XML 6.0 library, and writing VBA code to authenticate with the Vonage API and send the SMS message. The code is then assigned to a button for easy activation. Once set up, users can test the functionality by running the code and sending an SMS message to their specified phone number.