A feature that <A HREF="http://www.cioinsight.com/article2/0,1540,2061705,00.asp?kc=CMCIOEMLP112106CMS1">automatically encrypts laptop hard drives</A> will likely be the first thing security managers look at when the enterprise edition of Microsoft's new Vista operating system ships later this month. The feature, BitLocker, will intensify the spotlight on an area that has become a major concern for big companies in recent years.