You are likely familiar with the Ctrl+Home and Ctrl+End keyboard shortcuts that you can use to quickly go to the beginning or end of a document.
Have you discovered there is a mouse equivalent? If you are using the mouse, rather than having your hands on the keyboard, how do you go to the top or bottom of the document?
Right-click anywhere on the vertical scrollbar and select Top or Bottom. This works in Word, Outlook and your browser.