In preparation for the new “Xbox Experience” Xbox Live is going to down for maintenance on September 29th.
According to the posting on Major Nelson’s blog gamers can expect Live to be offline for up-to 24hrs. Here’s the scoop straight from the Major
On Monday, 9/29/2008 from 12:01 AM PST for up to 24 hours, Xbox Live will be offline for maintenance. As a result, Xbox LIVE and the ‘My Xbox’ section of Xbox.com will be unavailable, and the Xbox forums will be in read only mode (you won’t be able to post.) The remainder of Xbox.com will be available with limited interruptions.
What does this mean for you? Nothing. You will not see any changes on your end until Xbox sends the fall update.
