General MS Office Shortcuts

Function	Shortcut
Selecting the active tab of the Ribbon and activating the access keys.	[Alt] or [F10]. Pressing either of these keys again will move the control back to the document and cancel the access keys.
Move to another tab of the Ribbon.	[F10] to select the active tab and then [left arrow] or [right arrow].
Hide or show the Ribbon.	[Ctrl]+[F1]
Display the shortcut menu for the selected command.	[Shift]+[F10]
Moving the focus to select each of the following areas of the window: Active tab of the Ribbon,Any open task panes,Toolbar at the bottom of the window or Your document	[F6]
Move the focus to each command on the Ribbon, forward or backward respectively.	[Tab] or [Shift]+[Tab]
Move down, up, left or right respectively among items on the Ribbon.	Arrow Keys
Activate the selected menu or gallery on the Ribbon.	[Space] or [Enter]
Open the selected menu or gallery on the Ribbon.	[Space] or [Enter]
Activate a command or control on the Ribbon so that a value can b modified.	[Enter]
Finish modifying a value in a control on the Ribbon, and move focus back to the document.	[Enter]
Get help on the selected command or control on the Ribbon.(If no help command is associated with the selected command, general Help topic about the program is shown instead.)	[F1]