LONDON (Reuters) - A new e-mail virus capable of turning infected personal computers into "spamming" machines emerged on Friday targeting corporate and home users in Europe and the United States, a computer security expert said. Anti-virus software makers Trend Micro reported that tens of thousands of its corporate computer users in France and Germany were hit on Friday afternoon by the virus, dubbed "Mimail.C." By 11:30 a.m. ET on Friday, there were reports of infections in the United States too, said Raimund Genes, European president of Trend Micro. The firm had a "medium risk" rating on the bug. "We may...