The 'Delete XLC functions' must be used with caution because it deletes all functions "OVD", "UND", "ODI", "UDI" and "EQS". Your worksheet will look the same but with XLC functions removed your equation objects become static graphic that cannot be updated. Your worksheet is now a native Excel file and can be sent to a user without XLC.

WARNING: It is strongly recommended that you always save an XLC version before you remove XLC functions! You cannot 'undo' this command.