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As compensation for the maintenance, those who meet the following requirements will have their subscriptions extended by the number of days the maintenance lasts:
Service accounts containing characters on the Worlds within the Chaos data center (Cerberus / Lich / Moogle / Odin / Phoenix / Ragnarok / Shiva / Zodiark) before Friday, September 18, 2015 at 9:00 (GMT).
Service accounts with an active subscription.
Folks that transferred from none of the above had no downtime.
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For players outside Europe who have characters on the Chaos data center, Square Enix ask that you try it out. If you experience latency issues, you will be allowed to transfer from Worlds within the Chaos data center to Worlds within the Elemental, Gaia, Mana, Aether, or Primal data centers free of charge for one week.