This API is deprecated. These APIs are still functional for backward compatibility reasons - but no new feature is surfaced through these APIs. For any new development work, refer to the OpenSocial Microblogging APIs.
To retrieve messages posted to a message board, look at the board feed to find the entry ID of the message, and then request that entry.
See Authenticating requests for information about how to authenticate the request.
An Atom entry document containing the message.