A vehicle interior mirror system comprises a housing adapted for releasable mounting to a receiving structure on the interior surface of the windshield of a vehicle. A first electrical component/accessory preferably is included in the housing. A rearview mirror comprising a rearview mirror element attaches to the housing by a pivot joint, the rearview mirror being pivotally adjustable about the housing and the housing remaining fixedly mounted to the interior surface of the windshield of the vehicle while the rearview mirror is being adjusted. The rearview mirror includes a second electrical component/accessory. A removable cover on the housing provides access to at least the first electrical component/accessory in the housing. Preferably, electrical wiring passes through the pivot joint, while the rearview mirror is an electro-optic mirror. Various electrical components/accessories can be housed in the housing that attaches to the windshield, such as a rain sensor, a compass sensor, a headlamp sensor, an antenna, a camera, a microphone, or the like.