Ticketmaster historically has had a very unusual architecture – they wrote their own operating system for the VAX, and ran their core application on top of it.

Ticketmaster historically has had a very unusual architecture – they wrote their own operating system for the VAX, and ran their core application on top of it. When the VAX reached end-of-life, most users had a migration path elsewhere – VMS users went to Alpha, Unix could either go to Alpha or to a competing Unix platform – Ticketmaster didn't have any such path, because when you write your own operating system, porting it to a new platform is all on you. It didn't help that most (all?) of it was written in assembly language. So they ended up writing their own VAX emulator for Linux, and hence their in-house VAX operating system could continue to run as an app under Linux. And they've been trying for years to get away from all that legacy on to a more mainstream platform. (And for all I know that legacy system is still running today.) But this breach clearly has nothing to do with all that, since it involved a breach of the Snowflake cloud database. So either the legacy system's replacement, or some supporting system. Side note: Terry Davis was one of the developers of Ticketmaster's OS, before he wrote TempleOS, although they created their OS years before he was hired. He credited working on Ticketmaster's OS as part of his inspiration for writing his own