For keyboards with a Microsoft button (flag)

[Flag] + [E] = opens (windows) Explorer
[Flag] + [F] = opens (windows) search
[Flag] + [D] = minimizes all windows, repeat - and they open again
[Flag] + [M] = minimizes all windows

Microsoft Word
F12 = Save as
F7 = starts spelling control
[SHIFT] +F7 = synonyms (click the word you need synonym for)

Microsoft Excel
[CTRL] + [SHIFT] + 1 = Decimal format
[CTRL] + 9 = Hides rows
[CTRL] + 0 = Hide colums
[SHIFT] + [CTRL] + 9 = Show hidden rows
[SHIFT] + [CTRL] + 0 = Show hidden colums
F11 = create chart based on selected data
F9 = Calculate everything
[ALT] + [ENTER] = starts new line in SAME cell
[CTRL] + [SHIFT] + right arrow = Extends selection to last column with data
[CTRL] + [SHIFT] + down arrow = Extends selection to last row with data
[CTRL] + [SHIFT] + End = extend selection to last righthand corner with data
[CTRL] + Shift+ arrows = extend selected area.

Web browser
[CTRL] + [N] = Opens a new window
[ALT] + up / down arrows = Scroll vertically on a page
[CTRL] + [W] = Close the browser window
[CTRL] + [B] = Save current page as a bookmark
[CTRL] + [D] = Adds bookmark to your 'preferred' list
[TAB] = Navigate to the Address line
[CTRL] + [H] = History of sites you've recently visited