Collaborating on documents by e-mail may be streamlined into a unified process. In one example, a user creates a document in an online document service, and sends the document to collaborators by mailing a link to the document. The document may have permissions set so that the creator of the document, and any user on the e-mail distribution list, can read and edit the document. When a user receives the e-mail, that user may open and edit the document. Upon closing the editing application, the user may be presented with an appropriate interface to create a reply e-mail.