A few eagle-eyed observers noticed that DLC for original Xbox games has already been removed ahead of Microsoft's big shutdown date.
Microsoft has already stated that it will be shutting down Xbox Live support for original Xbox titles in April, so when the DLC for original Xbox games disappeared, most presumed it was an early indicator of that move.
However, Microsoft says it was a mistake and that Xbox owners will be able to buy content until the shutdown date. Not that there is much DLC to buy on original Xbox, of course. But if you did have your eye on some, for whatever reason, best make your move now.