I beleive that the day the Final Fantasy server's started to have issues is when the W32.Beagle.A@mm Virus when live to the internet world. This might be why they are doing the maintenance on their servers.
Since POL has a mailing System, it's possible that the Mass Emails from the virus bogged down their system.
Below is the information about the Virus.
W32.Beagle.A@mm is a mass-mailing worm that accesses remote Web sites and sends email to any addresses it finds. The email has the following characteristics:
Subject: Hi
Filename: <Random>.exe
Filesize: 15,872 bytes
The worm will only work until January 28th, 2004 (see note at step 1 below).
Some customers have reported that Trojan.Mitglieder.C has been discovered on computers infected with W32.Beagle.A@mm.
Symantec Security Response has developed a removal tool to clean the infections of W32.Beagle.A@mm.
Also Known As: I-Worm.Bagle [Kaspersky], WORM_BAGLE.A [Trend]
Type: Worm
Infection Length: 15,872 bytes
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: DOS, Linux, Macintosh, Microsoft IIS, OS/2, UNIX, Windows 3.x