A document management system enables multiple users to collaboratively contribute to the contents of a document via any suitable medium for transporting and storing documents, including email, shared drives, replicated work spaces and centralized storage systems. A tracking strategy is employed, in lieu of a central repository, that is based upon medium-independent versioning. Each version of a document that is created and saved by a user is given a unique identifier. The versions are submitted to a global service for ratification as the next authoritative version of a document. A submitted version that forms the next step in a linear sequence is ratified as the authoritative version of the document, whereas the version which does not meet this criterion becomes identified as a new document. Support is provided for users who create versions off-line, as well as users who are not subscribers to the system.