More than slightly concerning, considering I trust Excel to do basic arithmetic on a regular basis.
(see also this thread)
some kind of display thing....
I just did 850 * 77 that gave 65,450.000
then the 850 * 77.100 gave 100,000.000
when I did =d8-c8 i got 85.00
but wnen i manualy entered 100,000 and 65,450 and did the subtract i got 34,550.00
so my off the cuff look says that internally the number is right but the display is wrong.
but yes MSFT needs to see this and jump on it.