It is protected, yes. It must, however, remain protected in order to prevent certain locked cells from being modified. It is a protected worksheet with tracked changes enabled. I've made a macro that activates whenever a change is made to the worksheet. This is why undo is greyed out. When you use the Worksheet_Change function, VBA clears the undo stack. My solution to this is to save the worksheet to a hidden one before each change is made, and then restore it if the user wishes to undo an action. I just need some help on how to do this programatically.