Is Windows Vista's user security elevation better than Mac OS X's?
Will Windows Vista have an edge in user security elevation over the Mac OS X?
Both Windows Vista and Mac's OS X strive to ensure that most users and actions are done by accounts with limited permissions and rights (Microsoft has deemed this Limited User Account or LUA). Both OSs prompt the user, even if they are administrator or root, for an additional logon and confirmation when the user (or a program running with their user context) attempts to do something that requires elevated privileges (e.g. install a program, modify the system kernel, etc.).
Mac's OS X has had this since the beginning and Microsoft's upcoming Windows Vista will be released with a similar mechanism. I've tried out both OS X and Vista, and to be honest I didn't see much difference. I was delighted to see Microsoft adopt a similar LUA strategy. While it won't stop all malware and hackers, it will decrease some of the older malware and make it tougher for new malware to succeed. Most importantly, a LUA strategy will prevent most spyware and adware from being automatically installed against the user's wishes, and that's a good thing. Security Adviser | InfoWorld
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