The LOTRO Game Servers will be offline for maintenance on October 3rd, 2012 from 9:00 AM until 12:00 PM Eastern (-4 GMT). Additionally, the LOTRO Store will be offline for maintenance at 6:00 AM Eastern. During these downtimes we will be making some back-end configuration changes to the LOTRO Store and performing an upgrade to the in-game browser. Thanks for your patience, and we’ll see you back in the game soon!
Source: LOTRO Forums
Update:. The planned downtime has been cancelled.