Microsoft voiding Xbox 360 warranties in Columbia
Apparently, Microsoft doesn't take kindly to Xbox 360 users logging into Xbox Live in Columbia. Those who do get their console warranty voided.
Since XBL is not official in Columbia, users that log in to the US version aren't allowed to get repairs performed by tech support.
Engadget has more info on their site and Gamers.co have a recording of a call made to the support center. You'll need fluent Spanish to get the most from it.
You can thank Babel Fish for the lovely translation.