The outcome using either method should be camera-ready copy for use when ACS prints the abstract book for each meeting. If you are using a Macintosh, Word 6 for the Macintosh opens the file. The electronic abstract can be filled in as a form, printed, and mailed directly to a symposium organizer or program chair. Alternatively, when sending the abstract form, you may wish to check with the symposium organizer or program chair to determine if submission via an email attachment is acceptable to him or her. Consult your email documentation for the proper file attachment procedure.
Someone has to generate an original and four copies.
Unless given a specific exemption, the paper presenter should assume the responsibility for the original and four copies. From personal experience, sending attachments is dicey. Never assume that the attachment arrived properly.