This feature in Word 2007 will send out an email with your Word document attached, that other users who get your document will be tracked of the changes they make to your document. This is helpful if you'd like several others to review and make changes that you'd like later to review and approve their changes when they email the document back to you. All tracked changes will be in red including added or deleted text. To email a document for review first save your document and while it's still open you'll have to add the "Send for Review" button to your QAT (Quick Access Toolbar), and once added you'll click on it and it'll attach your Word document into your email program.

Purchase the training video and you can see this in action for yourself!