More: - It is designed well for medium-length content, say a few paragraphs or so per message. - It works well, and is mostly understood to be used for asynch

More: - It is designed well for medium-length content, say a few paragraphs or so per message. - It works well, and is mostly understood to be used for asynchronous communication. - Easily and usefully searchable. - Captures state/context well. - Threaded