An office partition system including at least first and second panels and a sliding privacy door guidably supported against the first panel via an elongated horizontal guide. The elongated horizontal guide has a channel that receives the privacy door and a mounting structure for mounting the guide to a horizontal track of the first panel. The elongated horizontal guide has a width that is substantially equivalent to the width of the first panel. The privacy door includes wheels that may support the entire weight of the privacy door. The privacy door may move from a first, open position allowing access to an interior space of the office partition system via an opening to a second, closed position restricting access to the interior space via the opening.