OK... Found a makeshift solution...
Its a solution by our co-MPV Dr. U.B. Pavanaja, select the cell or cells in excel, now go to Format Cell, and then option Custom under Number Catagory !!
Here, enter this custom formating vallue... !!
##\,##\,##\,##0.00
Now it should re-format the digit in this style,
12,34,56,789.00 but its a make shift solution as if you have digit bigger than that, you will have to do increase the
##\, according to your needs.. !!
How ever its not any offcial reply from MS
Post back if any more problem !!