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"Drysc reports that a number of realms are under investigation for performance issues and will be undergoing a scheduled maintenance at 5:00 AM PDT on Wednesday, March 12 with a foreseeable downtime of 1 hour (update: Zorayn notes that downtime will be extended to 2 hours as opposed to one). As Drysc edits the thread, realms are added (or removed) regularly. From a quick perusal of the realms, it seems as though it is the Nightfall Battlegroup that is affected. Blizzard currently lists the affected realms as follows:Aerie PeakAltar of StormsAlterac MountainsAnvilmarArygosBlackwing LairDeathwingDemon SoulDoomhammerGnomereganIcecrownJaedenarKel'ThuzadLethonOnyxiaSentinelsTanarisThe Venture CoUldamanUndermineDrysc further notes that other Battlegroups are under close observation and will be taken down for maintenance should any issues arise that might require it."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/03/12/select-realms-to-undergo-maintenance/>