European finance, insurance, banking, news agencies, e-commerce and market research companies. We're talking large companies on the same scale.
In my experience those kind of companies are heavily involved with big players like MS, HP, etc. who all push their own proprietary crap. Bundle this with a "we don't allow employees to install other browers so why should we care/test/develop for other technologies? We can even assume every PC has ActiveX installed and ready, so hell yeah let's use that!"
I've been working with some large enterprises in the past (50k+ employees), all of them only use IE and all of them are full with some crappy ActiveX software, some by HP, some homegrown, it's really full of that crap. :( Even software that would support multi-platform is crippled in a way that only Windows+IE works, because in the projects noone cares if some other browser or (god forbid) another OS is supported.