When others are working on your document, you aren’t always sure what kinds of changes are being made. Even if you have turned Track Changes on, you might want to see at a glance what some of the big changes are between two versions of the same file. Word offers the Compare tool to easily identify the changes when you evaluate two documents. In addition, the Combine tool brings together the changes in two or more documents to create a merged draft that you can use to finalize your content.
Open the first document that you want to use.
Click the Review tab.
A list of choices appears.
The Compare Documents dialog box opens.
Click the Original ...