If the text box won't resize in Word or Excel, check if the document is opened in the Compatibility Mode, and convert it to a newer format.

Excel uses rows and columns that are made up of cells to store data. If you decide to use Excel for your tasks, learning how to make Excel cells fit text is very important.

How to Format Text in an Excel Spreadsheet. Excel's text formatting capabilities can make the results of your financial, statistical or scientific spreadsheet calculations more esthetically ...

You can wrap text in Excel in several ways to ensure that all the text in a cell is visible at once. You may also want to edit the cell height.