[Tilted Irish Kilt]

(from the article):"Oklahoma's Xerox representative told them that the problems stemmed from a power failure at a data center, and power had been restored quickly.

According to NPR , the fault was caused by a routine Xerox software upgrade , which created the 'glitch'.

Tax-chick:" Test run for when they’re ready to trigger the Zombie Apocalypse?"

Maybe so. Perhaps to evaluate recipient response, especially since so widespread to States east of the Mississippi.
Already two distinct explainations : power failure , or software glitch.
OPTIONAL ALTERNATIVE : test run

[tacticalogic]

According to NPR , the fault was caused by a routine Xerox software upgrade , which created the 'glitch'.

It's possible that it was a software-induced power failure. Big UPS systems have their own control systems that, among other things, can interface with the computer it's powering, and tell them to do a controlled shutdown if the batteries are about to die, or refuse to bring power online it if senses an overload condition.

A software upgrade on the UPS system could take down everything in the room if it went sideways.