The company I work for is sending 9 people to Davos at the beginning of April for business purposes. I have been asked to arrange their transfer from Zurich airport to Davos. Where can I get a Mercedes-Benz V-Class transfer service?

Are you sure the V-Class is right for you? As far as I know it seats up to 8 passengers, although there may be some tuned versions with more capacity. I think in your case it would be better to get a Mercedes Sprinter. It can be rented from many chauffeur services in Zurich, for example you can contact "Zurich Limousine Service". I asked my brother who lives in Basel and uses this service regularly.