Excel on Windows Phone

Let's try something together, my esteemed Windows Phone users. Open Excel on Phone 7, enter anything in any cell, make that cell boldface, and finally change font color. Nice, eh? Now try to revert that cell back from bold to regular typeface. Tough luck, so it seems, as Excel on Windows Phone does not permit to take back the formatting which has been applied to a cell. You can change it, but not undo.

Plus, there are several functions missing, some of which rank among the most versatile and useful Excel functions like SUMPRODUCT(). I could excuse if Excel on Windows Phone did not (yet) implement the whole slew of functions introduced with Office 2007 and 2010, but come on, sumproduct, really?