Recent surveys indicate the growing usage of mobile devices in the workplace. According to a 2005 study released by Nokia, 21% of United States employees carry personal data assistants (PDA), while 63% carry mobile telephones, all for business use (Phifer, 2006). One survey found USB storage drive usage in the workplace at 73% in 2006, up from 65% in 2005 (Hackers using a new threat, Web@Work survey, 2006).