A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This method is a little complicated so I'll walk through it step-by-step based upon a single cell. Let's assume D8 is the first cell.
- First thing to do is restrict the values that the cell can contain to blank, Y or N. With D8 selected, go to to the Data tab's Data Validation and choose Allow: Custom, Formula: =OR(D8="Y",D8="N") and leave Ignore blank checked.
- Next, with D8 still selected, go to the Home tab's Conditional Formatting, New rule. Create a new rule using Use a formula to determine which cells to format and use the following for Format values where this formula is true:
=D8="Y"
Click Format then go to the Number tab and set a Custom number format of:
;;;[Color50]ü
Click OK to save the formatting and then OK again to save the rule. 3. Almost done. With D8 still selected, set the font to Wingdings, then tap Ctrl+1 and set a Custom number format of:
;;;[Color9]û 4. Set cell alignment, column width, etc as you see fit.
Copy those Custom number formats directly from this page and paste them into the Format Cells dialog's Number tab. The trailing characters are different although they may look the same at first glance.
As you can see from this image, D8 actually contains a Y (see the formula bar) but is showing a green check. I've copied and pasted D8 into D9 and changed D9 to N to get a red x. The copying brings across all of the special cell attributes previously created for D8.

If you want a boxed x and check then consider using ý for x and þ for check. There are many other checks and exes in teh graphic fonts available within Character Map. (All programs, Accessories, System Tools, Character Map or Start, charmap.exe).
The Custom number formats are using the following table to get their color numbers. Change the xx in [Colorxx] to any of these possibilities: