Blackberry customers as well as industry observers remained hopeful but concerned–and largely uninformed–last week following a court ruling that could lead to the shutdown of BlackBerry’s wireless email system in the United States. BlackBerry maker Research In Motion maintains that the company has tested and readied a legal, technical workaround that will keep itself and its customers in business even if a judge rules against the company. But a lack of technical details about the workaround–which RIM refuses to divulge–worries some industry observers.