On Tuesday February 20th from 0200-0500 PT Xbox Live will be offline for maintenance. As a result, the ‘My Xbox’ section of Xbox.com will be unavailable, and the Xbox forums will be in read only mode (you will not be able to post.) The remainder of Xbox.com will be available for your browsing pleasure.
This is for maintenance only, there will be no new features that will appear on Xbox.com, your dashboard or Xbox Live when we return to service.
So, to recap: This is all for server maintenance only.