A vehicle interior rearview mirror assembly comprises a housing adapted for releasable mounting to a receiving structure on the interior surface of the windshield of a vehicle. A plurality of accessories preferably is included in the housing, with at least one of the plurality of accessories being adapted for viewing through the windshield of the vehicle to which the housing is mounted. Preferably, a rain sensor is included in the housing. A rearview mirror 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. Preferably, electrical wiring passes through the pivot joint. Preferably, an electro-optic mirror is included in the rearview mirror. Various electrical components can be housed in the housing that attaches to the windshield. For example, a compass sensor selected from one of a magneto-resistive sensor, a magneto-inductive sensor, a magneto-capacitive sensor and a flux-gate sensor can be included.