Google's ( GOOG) quest to organize all of the world's information is running into opposition on the desktop, where the company hopes to make inroads against Microsoft ( MSFT). At issue is a feature in Google's Desktop Search that lets people search for data on more than one computer. This requires information to be stored on the Mountain View, Calif., company's servers. Tech research firm Gartner has urged large companies not to use the service for security reasons. "Google promises that this information will be encrypted and accessible to only a small set of Google employees who will not peruse it," Gartner says in a recent report. "Nevertheless, Gartner believes that its mere transportation outside the enterprise will represent an unacceptable security risk." Though Google says it takes steps to safeguard data that it keeps for as long as 30 days, those assurances may not be enough to allay the concerns of large companies. Sometimes, companies are required to ensure that customers' data are never out of their jurisdiction. "There are laws and policies that this subverts," says Whit Andrews, a research vice president at Gartner, in an interview. "Whether or not Google maintains security is not relevant to a large number of chief information officers ." Google says it's mindful of concerns about security on Google Desktop Search. Individual users must personally activate the multicomputer search feature, which serves as a layer of security. In a recent blog posting, Google's Enterprise team writes, "We understand that a company's data is more precious than gold -- and you don't go passing your gold around." The company agrees with Gartner's conclusion that firms that let employees use Google Desktop Search should switch to the version for large companies and restrict its use. Experts say having the ability to search more than one computer may increase efforts by the government to collect information from the search-engine giant, which is fighting a federal subpoena seeking data to uphold a law against child pornography.