The problem started around 8 p.m. EST on Tuesday; it prevents BlackBerry customers' emails from being pushed to the handheld devices, affecting service throughout the Western hemisphere. As of 8 a.m, there was no word on when BlackBerry service would resume. NBC believes the problem could persist through the morning, and that users would likely experience delays in receiving the backlog of missed messages even after RIM resets the system. In the meantime, we urge RIM's 8 million-plus BlackBerry subscribers not to stray too far from their computers.