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.

Text Box in Word helps focus on content & displays essential text such as headings and quotes. Learn how to use or edit Text Box in Word ...

Text boxes in Microsoft Word are graphic elements that contain editable text. You add these objects to documents for extra visual appeal or to call out sections of text within the document.

Editing text in Word 2007's text boxes is similar, but you'll need to actually click on the text box to activate it so you can "get inside." Unlike standard text on a Word document where you ...