According to Kotaku, Microsoft has banned users who have obtained early, unauthorized versions of Halo 3: ODST on Xbox Live. As Xbox Live Chief, Stephen Toulouse, was quoted in the news article:

"I can be clear that this applies to illegimate copies only, the ban covers the Xbox LIVE account and could possibly include their console depending on the results of our investigations (which are ongoing)."

Microsoft has not disclosed how they are able to differentiate legal copies from illegitimate ones on Xbox Live at this time.


Source: Kotaku