PSN maintenance starts on March 1 at 11am ET

Expect some PSN downtime starting on March 1, from 11am ET until 2am ET the next day. The PlayStation Store on both the PC and consoles will be unavailable, as will account management and PlayStation Home. If you're signed in when maintenance starts, you'll be signed out automatically.


Source: http://www.joystiq.com/2012/02/24/psn-maintenance-starts-on-march-1-at-11am-et/#comments