How to Label the Columns of Microsoft Excel 2007 with Letters

Windows version of Excel 2007 or higher
1. Open Excel. You do not need to bring up a specific file. Just click to open the program, which will automatically open a blank spreadsheet.
2. Select the Office symbol button in the top left corner of Excel to open the menu. At the bottom right, click on the 'Excel Options' button. A new window will appear.
3. Click on 'Formulas' from the menu on the left and look mid-page under the heading 'Working with Formulas.' Uncheck the first item ('R1C1 Reference Style'), and you will return to columns labeled with letters. To change back to numbers, simply check the box once again. Click on 'OK' to close the window and save your selection.
Mac version of Excel
4. Open Excel and click on the 'Excel' menu option in the furthest top left corner. Scroll down and select 'Preferences' from the menu selections. A new window will pop up.
5. Click 'General' under the 'Authoring' heading to bring up the selections in the next window.
6. Remove the check from the box beside 'Use R1C1 reference style' to return column labels to letters, instead of numbers. Select 'OK' at the bottom right to save your options and close the window.