The changes are intended to revive an important security concept that has been a low priority among many Windows users and application developers.
"I don't think the notion of application runtime permissions are either well understood or well handled," said Jason Rimmer, chief architect at Vertex Inc., a tax technology and services provider based in Berwyn, Pennsylvania. "Coming from Unix, you're used to asking 'Does this run under root or not?' But Windows operators have never had to consider that. LUA will force that choice on people," he said.
Cependant, cela va obliger à modifier moult applications afin d'être LUA compliant : Least-Privilege User Account
Microsoft declined repeated invitations to discuss LUA's role in upcoming Longhorn releases, but says it is considering LUA for future releases as part of an overall vision for multilayered security known as "defense in depth," according to an e-mail statement attributed to Amy Roberts, director of the Security Business and Technology Unit at Microsoft.
Alors, cet info ? Un fake ou une réalité ? Et si c'est le cas, comment les ingénieurs de Microsoft l'implémenteront-ils ? 
Too bad "MS-root" can't watch over your grandmother when she opens emails."