Calendar control
 

I have designed a complex Excel spreadsheet app in which I am not the end
user that uses heavy vba including a calendar control. It was designed with
Excel 2003 and will be used on PCs with Excel 2003 and XP. I demonstrated the
app on a PC in which everything worked fine, however when I saved it to the
end user's PC it rejected the app because of a control not installed on the
machine.

Do we really have to do some preliminary installation on each PC using this
app because of the calendar control? Shouldn't the control operate on any PC
using the app?

Sam