Millions of people in North America, Asia, and Europe lost access to their email for up to 12 hours when a software upgrade caused problems with central systems at Canadian company Research In Motion, maker of the BlackBerry email device. The software upgrade had not been tested enough. BlackBerry users, who are known for sometimes checking their email every few minutes, were very angry with the company. Wall Street banks said that deals may have been held up because of their inability to use their favorite form of communication. RIM, who has 8 million subscribers to their BlackBerry service, announced that they were making internal changes to ensure that such an outage does not happen again.