In the open event of ThisWorkBook use this code to disable autocalculation
Use this to reset it to automatic, if required, in the before close event
To access the event editor, hit Alt+F11 and double-click ThisWorkbook for the workbook you're working with, in the Project Explore (on the left side of the screen).
Then select Workbook from the 1st drop down in the main editor area and select Open from the second drop down. Insert the first statemend above before the End Sub statement.
Then select Before Close from the 2nd drop down and new sub should appear...enter the second statement in there.
Save the workbook.
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