Between delays, executive defections and falling market share the news lately hasn't been rosy for RIM, but today it got at least one reprieve as a Federal Court in Canada ruled its use of the acronym BBM did not infringe another company's trademark. The lawsuit was filed last December by BBM Canada, a broadcast industry group that owns a trademark on the name but because they are in different types of businesses the court decided RIMs usage was acceptable. Accor