As announced a year ago and periodically since then, both the XBox 360 and PlayStation 2 versions of Final Fantasy XI will end service at 7:00 am Pacific / 10:00 am Eastern today, Thursday, March 31st. PC service for the game will continue and players of the soon-defunct versions of FFXI can convert their account in order to continue playing.
Read the full notice and the instructions how to convert accounts to the PC version on the Final Fantasy XI site.