The company said in a statement that it had ruled out security and capacity issues as a cause of the
outage that left millions of so-called "CrackBerry" addicts without access to their e-mail for several hours. The company also said the incident was not caused by any hardware failure or core software issue.
Ruling out those causes, the company has "determined that the incident was triggered by the introduction of a new, noncritical system routine that was designed to provide better optimization of the system's cache." In computing terms, a cache is a temporary storage area for that allows data to be served up quickly.
RIM offers explanation for massive outage