The Excel Iteration setting can be modified by going to Tools > Options then click on the Calculation Tab. Check or uncheck the Iteration box as appropriate.
Iteration should be checked (turned on) for these products:
- Commercial/Industrial Development Version 5, build 1.13 and earlier
- On Schedule Version 4, build 1.29 and earlier
Iteration should be unchecked (turned off) for these products:
Commercial/Industrial Development Version 5, build 1.14 and later
- On Schedule Version 4, build 1.30 and later
- all other products