Tech
BlackBerry: looks like buggy data routing system upgrade caused crash
BlackBerry-maker Research In Motion has just said an early investigation is pointing to a problem with an upgrade of a data routing system as having precipitated yesterday's three-hour service disruption and resulting slow email thruput.That said, RIM had a reason for this undertaking.
BlackBerry-maker Research In Motion 
The upgrade was part of an ongoing effort to expand capacity for long-term growth, it noted.
IMHO they need to do better to provide redundancies so that there's fallback. Redundancy, more colloquially expressed as Plan B. And Plan C.
Anyway it appears everything in the BlackBerry services universe is back to normal.
More as we learn more.