Excel has support for complex numbers, *eg: =IMSUM("5+2i","6+2i")*, and matrix calculations

*eg:*.

`=MMULT(B7:D9,F3:F5)`

However putting complex values into the the cells with existing matrix operations produces an error. Is there a way you can perform matrix calculations with complex values in Excel?

I'm on the Excel 2010 beta on Windows 7 and open to alternative applications.