Exo provides 219 bus lines, on-demand transit and paratransit service throughout the outer suburbs and exurbs of the Greater Montreal region of Canada.

[3] Prior to June 2017, bus service within the greater region of Montréal was provided by a number of different municipal services and local transit agencies known as Conseils intermunicipaux de transport (intermunicipal boards of transport, or CIT).

[13] In 2023, when the Réseau express métropolitain began service on the South Shore, most Exo lines that ran along the Samuel-De Champlain Bridge had to be rerouted to either Panama or Brossard stations.

[16] Exo services operate within the integrated fare structure of the Autorité régionale de transport métropolitain (ARTM) for Greater Montreal.

Exo bus and paratransit services are managed by subsidiary sectors, whose areas are defined by municipalities in ARTM fare zones C and D. (Sept. 2024) Saint-Placide