He added that he was pleased other retailers hadn't used the slip as an opportunity to break the street date themselves, and warned that any company doing so intentionally could expect Microsoft to withdraw its support.
"I'm happy at the moment that nobody has used that as an excuse to go and do silly things. We've been very clear with retailers that if they do choose to go down that path, then a lot of the support that we've given them, in marketing and things like that - that has an impact on it."
"We're pretty forceful in our approach to these things, because we want it to be a fair market for all."
Halo 3 is set to launch next Wednesday in the UK in a blaze of publicity, with hype levels rivalling the biggest of box office premieres, but Thompson isn't concerned that too much hype could be an issue.
"Everyone will talk about the money, and stuff like that, because that's a headline-grabbing idea - that gaming is potentially going to be the biggest entertainment event that hits this country this year."
"If you over-hype something that doesn't deliver on the promise, then you run the risk of a backlash and that can work against you. I honestly don't believe that's the case with Halo 3."
Thompson spoke to GamesIndustry.biz at a press event in which Microsoft was rounding up its Christmas line-up, and the full interview will be published next week.
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