Microsoft Word - Using Mail Merge to send bulk email
Source: Use mail merge in Word to send bulk email messages - Microsoft Support
Follow instructions in support article, in summary:
- Create a message you want to send in Word
- Select a mailing list data source, examples are Excel, Outlook contacts, databases
- Link the mailing list to the message and save
- Personalize content in the message and add fields from the data source like names, address
- Check message previews and send the emails