public IUserMessagesCollectionRequestBuilder Messages(User user)
        {
            var builder = new GraphRequestBuilder <User>(this.resultAggregator, () => new UserMailboxResponseHandler(user, requestManager, resultAggregator));

            return(builder.Users[user.Id].Messages);
        }
        public IGroupMembersCollectionWithReferencesRequestBuilder Members(Group group)
        {
            var builder = new GraphRequestBuilder <Group>(this.resultAggregator, () => new GroupMembershipResponseHandler(group, requestManager, resultAggregator));

            return(builder.Groups[group.Id].Members);
        }