Abstract: Apparatus, systems, and methods may operate to within the context of a shared document review process to receive an updated comment associated with an original comment by a comment series identifier. Further actions may include generating a comment differentiation identifier that serves to differentiate the updated comment from the original comment, and storing at least a portion of the updated comment and the comment differentiation identifier in a collaboration comment repository. Using stored document version history and a timeline, the state of the document at a particular point in time, and a history of the comment series can be rendered as a result. Additional apparatus, systems, and methods are disclosed.

Abstract: A method to enforce collaboration rules, in one example embodiment, comprises receiving a request to report a collaboration event to a collaboration workflow, receiving a reported time of the collaboration event, determining an origin of the reported time, updating the reported time with a central time service time when the origin of the reported time is not a central time service, and based on the updated reported time, selectively reporting the collaboration event into the collaboration workflow.