Incorrect formatting of numbers can cause errors in the merge.
![mailings tab mailings tab](https://www.purdue.edu/business/coeus/images/mailing_tab.jpg)
#Mailings tab zip
Format Numerical Data Correctly: Be sure that things like street numbers and zip codes are properly formatted for the way they should appear once the mail merge is complete.By selecting unformatted text, the value will adopt the formatting of the words around it and will blend into your document. Position the cursor in Word and select Home Clipboard Paste Special Unformatted text. Also, make sure the headers you choose match the merge field names, which will also make it less likely errors will occur. Copying words and numbers - Copy a single Excel cell containing a word or number. To make it easy for Excel to differentiate between data and labels, use bold text, cell borders, and cell shading that are unique to the header row. A header row is a row containing labels that identify the data in the cells beneath it.
![mailings tab mailings tab](https://i.ytimg.com/vi/kojfNEJsEBY/maxresdefault.jpg)