There was a reminder of this on the POL site and thought I'd mirror it here:
As previously announced on Thursday, March 19, 2015, PlayStation®2 and Xbox 360® service for FINAL FANTASY XI will end on Thursday, March 31, 2016, at 6:00 a.m. (PST).
As such, PlayStation®2 and Xbox 360® service will not be available after March 31, 2016, at 6:00 a.m. (PST) but your service contract will remain in effect.
So all of you that might be playing again but don't play on PC, you'll need to remedy that!