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"Between 5:00 a.m. and 6:00 a.m. PDT today (Sunday July 27th) all U.S. realms will be undergoing a rolling restart. Each realm should be down for about 15 minutes, though these things have a tendency to last longer than scheduled.The login announcement tells us that the servers are getting a hotfix applied to them, however there is no indication what the hotfix is for. If anything does happen to extend this restart, you'll see it here on WoW Insider."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2008/07/27/rolling-restarts/>