Not sure how far back it spans but reprots for xbox live being down started around friday night could have been earlier than that.
Xbox live is down atm most of the online games
right now are not working and the voicemail and messaging systems are down. Im sure that the downloading system
is also down. They now about it and are working on it. If you would like to track the status go to www.xboxlive.com
and search status this will bring you the xbox live status whether it is working atm or not just yet they hope to have it working this week. This issue started on friday or saturday this past week.