Just because MS can technically do this, doesn't mean they didn't do it in bad taste. They removed the DLC without warning, before they even announced they were shutting the servers down. It's not hard at all to re-upload the DLC (H2 at least) back up on the servers. If enough people complain, I see no reason why they just won't put the DLC back up for a little bit. [Edited on 02.10.2010 3:50 PM PST]