Some people may (like me) want to play the jp version of PSOBB.
However, today Sega ran out of luck. The new update releases 2 new quests, unlocks twice drops and the "shoutbox" thingie when you find a rare. Hence plenty of people playing.
1 hour after the servers were back up, someone found a photon sphere from a box. The servers haven't been up since.

So if you planned on playing today: don't worry, the game has been under maintenance for 9 hours now and the ppl at Sega have no idea when they will have fixed that. But they ARE working on them. It's not your PC having a problem, you haven't been banned or anything. They REALLY are under maintenance.

Apparently they report every 3 hours about the situation, so the next report should come in... half an hour. More later...