Enter: Upon signing up for either green invoicing option - to either receive monthly invoices via email or to receive a summary invoice by postal mail - you will be automatically entered into the sweepstakes. Only one entry per company will be accepted. No purchase necessary to enter or win. All entries will be eligible each month until the conclusion of the sweepstakes promotion.

Winners: All prizes will be awarded. Winners will be selected in a random drawing on the last business day of each month beginning June 30. Drawings will be held on June 30, July 31 and August 29 at 4:00 PM ET. Winners will be notified* by phone or e-mail. Winner grants his or her permission to have their name, city, state used for announcement posting to the AT Conference web site. AT Conference is not responsible for lost, misdelivered, misdirected, mutilated, illegible or stolen entries.

Prizes: One prize of a $100 account credit will be awarded in each monthly drawing. Account credits will be applied to the winning company's invoice the month following each drawing. Prizes cannot be assigned, transferred, substituted or changed. Payment of federal, state, and local taxes is the sole obligation of the winner.

Eligibility: Entrants must have an active account with AT Conference and an assigned account number. Sweepstakes void where prohibited or restricted by law. Employees and their families of AT Conference, their affiliates, subsidiaries, advertising and promotional agencies are not eligible to win.

* During AT Conference business hours - Monday-Thursday: 8:00 a.m to 7:00 p.m. ET; Friday 8:00 a.m. to 6:30 p.m. ET.