$ mailbox2ics.py -o group_schedule.ics imap.example.com mailbox2ics  "Calendars.Alice" "Calendars.Bob"
Password: 
Logging in to "imap.example.com" as mailbox2ics
Scanning Calendars.Alice ...
Found: In the office to work with Bob on project proposal
Found: In the office
Scanning Calendars.Bob ...
Found: In the office to work with Alice on project proposal