Lighthouse tickets:
http://p2pu.lighthouseapp.com/projects/71002/tickets/18-email-based-interaction
http://p2pu.lighthouseapp.com/projects/71002/tickets/246-no-way-to-see-what-messages-have-been-replied-to
http://p2pu.lighthouseapp.com/projects/71002/tickets/77-notifications-update-frequency
http://p2pu.lighthouseapp.com/projects/71002/tickets/115-edit-comments
http://p2pu.lighthouseapp.com/projects/71002/tickets/222-delete-messages-from-inbox
http://p2pu.lighthouseapp.com/projects/71002/tickets/269-email-updates-for-followers
http://p2pu.lighthouseapp.com/projects/71002/tickets/306-organizer-should-be-able-to-delete-messages-from-any-participant
http://p2pu.lighthouseapp.com/projects/71002/tickets/592-bring-discussion-thread-styling-in-line-with-google-yammer-facebook-etc