Alt+Ctrl+S

Toggle Split of document window

Ctrl+scroll mouse up/down

Zoom in/ out

Alt then w, q

Open Zoom Menu (no native shortcut exists for zoom in/ zoom out)

Alt+Ctrl+O

Switch to Outline view

Alt+Ctrl+P

Switch to Print Layout view

Alt+Ctrl+N

Switch to Draft view (used to be normal view)

Ctrl+F6

Switch forward to next open Word documents (easier than Alt+Tab as only word documents are iterated)

Ctrl+Shift+F6

Switch backwards to previous open Word documents (easier than Alt+Tab as only word documents are iterated)