Research in Motion Ltd. this week attempted to restore service to Blackberry devices after a three-day outage that has plagued global markets.

This week, the Blackberry outage spread to U.S., Japan and Singapore. Previously affected regions include Europe, Africa, and the Middle East.

On Wed., Research in Motion Ltd. said it is working night and day to restore all services to normal. It acknowledged that subscribers in Americas may be experiencing intermittent delays.

The company this week blamed a core switch failure in RIM’s infrastructure. The failure is designated to failover to a backup, which did not function correctly.

As a result a backlog of data was generated and must be cleared prior to restoring service.

Select U.S. retailers in Sept. discounted Research in Motion Ltd.’s Blackberry Playbook by as much as $200 after slow demand.

The Blackberry Playbook includes a 7-inch screen, 1Ghz Dual-Core CPU, Dual HD Video Cameras, and Wi-Fi support.

RIM in June said the Blackberry Playbook shipped 200,000 units in the fiscal second quarter, below company estimates.

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