Research In Motion Ltd.'s (RIM) network outage, which kept many BlackBerry users from being able to send and receive messages on April 17 and 18, was caused by a new cache-optimization system routine. RIM said that although the system routine was tested before implementation, "pre-testing…proved to be insufficient." The new routine caused interaction errors between a database and the cache. RIM tried to failover to a back-up system, but it didn't go as well as planned, delaying service restoration.

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