osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now
Wiki out of date - Email settings: Fetch frequency.
Continuing with my setup I found mentioned in the Wiki http://osticket.com/wiki/POP3/IMAP_Setting_Guide that there was a need to set up a cron job to fetch emails.
That now seems to be out of date as far as the latest version goes (v1.9.14). The Email Address screen has a Fetch Frequency which seems to work without any cron job being needed.