Hi,

Just upgraded to office 2007 with windows 7 operating system - can anyone tell me where the Help key is in office 2007 - can't find it. Thank you!

F1 ;)

As Ben said F1 has always been the Help Key. However there is a small question mark icon on the right side above the ribbon, that will also open the Help Search screen.

Last suggestion... though the F1 builtin tutorials are very good, I use GOOGLE to great benefit as well searching for the same functions:

Search:

Excel 2007 Count Unique
Excel 2003 Sum based on criteria
Excel 2000 Remove duplicates

You get much better answers with questions in Google like this than you do using the search feature in Excel's help files.