While you are editing a checked out version of a document, you can do a series of intermediate saves of the document's content before your subsequent checkin. The document's version status becomes a reservation, where a placeholder is created for the edited document that you will check in later.
The version will not maintain a history of these content saves. The version preserves only the content as it is at checkin time.
NOTE The document must already be in an object store and checked out before you can use this feature.
To do intermediate saves of a checked out document in an Office application