To use and navigate the toolbars in Office 2007, 2010 and 2013 versions, you can hold the F6 key and press the corresponding characters to move.
Ctrl + A: Select all slides or select all contents in the Slide depending on the current cursor position.
Ctrl + M: Add a new Slide.
Ctrl + B: Bold selected text.
Ctrl + I: Italicizes selected text.
Ctrl + U: Underline the selected text.
Ctrl + '+': subscript (chemistry)
Ctrl + Shift + '+': superscript (exponent).
Ctrl + T: Open the Font format dialog box.
Ctrl + F: Open the search dialog (Find).
Ctrl + H: Open the replacement dialog box (Replace).
Ctrl + K: Insert link (Hyperlink).
Ctrl + C: Copy selected text.
Ctrl + V: Paste the selected text.
Ctrl + Z: Restore previous action (Undo).
Ctrl + Shift +>: Increase the font size.
Ctrl + Shift +
F4 or Ctrl + Y: Repeat the previous operation.
F7: Check for spelling errors.
Ctrl + Backspace: Delete one word in front.
Ctrl + Delete: Delete a word at the back.
F5: Start a slideshow from the first Slide.
Shift + F5: Start a slideshow from the currently selected Slide.
ESC (or - key): Exit the slideshow to the editing interface.
N (arrow right or down): Move to the next Slide while playing.
P (arrow left or up): Move to the previous Slide during a slideshow.
Ctrl + N: Open a new PowerPoint window.
Ctrl + D: Copy the selected Slide right below that Slide (duplicate the current Slide).
Ctrl + S: Save the Slide (Save).
Ctrl + P: Print Slide (Print).
Page up / down: Move between slides.
Shift + F9: Turn on / off gridlines in Slide.