Excel pulling information from another SpreadSheet (source) when (source) is closed

Hi,

I have been struggling with changing some fields in a SpreadSheet from COUNTIFS and SUMIFS to SUMPRODUCT as below:

=COUNTIFS('S:\Data\HQ\2014\Report.xlsx'!Table2[RFI Date],">="&B1,'S:\Data\HQ\2014\Report.xlsx'!Table2[RFI Date],"<="&B2)

to

=SUMPRODUCT(('S:\Data\HQ\2014\Report.xlsx'!Table2[RFI Date]>=B1)*('S:\Data\HQ\2014\Report.xlsx'!Table2[RFI Date]<=B2))

It still seems to require the source spreadsheet to be open.

Can somebody please advise is it possible to pull cell data from a closed source SpreadSheet without first opening it or using VBA?

Thanks,

Charles