According to msdn, Calculation is a property of the Application object. Hence, I would suggest (untested): 
  $excel->{Application}->{Calculation} = xlCalculateManual;

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"When you are faced with a dilemma, might as well make dilemmanade. "

In reply to Re: ole (excel xp) problem by NetWallah
in thread ole (excel xp) problem by denap

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