or in Word 2010 for that matter?
Select All will choose the entire contents of the Word document, text, images, the lot.
It’s on the Home tab, Editing block, Select then choose ‘Select All’.
Quite likely the Select All option is ‘buried’ because most users will use the keyboard shortcut ‘Ctrl + A’ which has ‘selected all’ not just in Word but many programs since before Windows existed.
That menu item has some useful options to keep in mind for other situations like Select Text with Similar Formatting’ which is handy for finding non-standard text formatting that has creeped into a document. Select the similar formatting text then apply a style to them all.