Getting delegate access to another users Exchange folder in Viewpoint

delegate_access.rb

require 'json'
require 'viewpoint'
include Viewpoint::EWS
puts "Usage: cal_items.rb <email>" if ARGV.length == 0
email = ARGV[0]
cfile="creds_test.json"
creds = JSON.load(File.open(cfile,'r'))
Viewpoint::EWS::EWS.endpoint = creds['endpoint']
Viewpoint::EWS::EWS.set_auth(creds['user'],creds['pass'])
cal = GenericFolder.get_folder(:calendar, email)

items = cal.todays_items

items.each do |it|
  it.deepen!
  puts "Subject: #{it.subject}"
  puts "Location: #{it.location}"
  print "Attendees: "
  it.required_attendees.each do |ra|
    print " #{ra.name}"
  end unless it.required_attendees.nil?
  puts ""
  puts "\tStart: #{it.start.new_offset('-6')}"
  puts "\tEnd: #{it.end.new_offset('-6')}"
  puts "-----------------------------------"
end