Blackberry's problems have now apparently spread to North America as users are reporting on Twitter that they've lost access to their emails.
This comes after two days of patchy service by Blackberry across the EMEA regions with South America being badly hit as well.
Research in Motion confirmed that a defective switch was what caused the outage in the first place but this appears to have rapidly snowballed into something RIM is struggling to cope with.
The Canadian company isued a statement saying: "Although the system is designed to fail over to a back-up switch, the fail over did not function as previously tested. As a result, a large backlog of data was generated and we are now working to clear that backlog and restore normal service as quickly as possible."
It is understood that while Blackberry Enterprise Services (BES) has escaped unscathed, its Blackberry Internet Services (BIS) have been taken down, which means that affected users are likely to be private rather than business customers.
The timing for Blackberry's blackout couldn't be worse. Apple will launch its iOS 5 later today and its iPhone 4S handset by Friday in the UK. One of the big improvements in iOS 5 will be the inclusion of iMessenger, Apple's answer to Blackberry's own BBM.