No, all that does is show a separate icon in the task bar for each spreadsheet you have open. All of the spreadsheets are still contained within the single Excel window. FWIW, I already had that box checked by default.

Can anyone think of a single advantage to this window-in-window format? Oh, wait, I actually did discover one thing that works better. When cutting and pasting between separate instances of Excel, formulas are pasted as values only, whereas in the window-in-window version, the formulas are carried over. Other than that, I can't think of anything.

tanstaafl.