More on Microsoft Passport

It’s easy.
There’s only one name and password to remember, and after you sign in to one participating site, you can sign in to others with just one click.
It’s fast. You can store information about yourself in your Passport profile and wallet, so you won’t have to retype it when you visit or make online purchases at participating sites.
It’s secure.
Your personal information is protected by powerful encryption technology and strict privacy policies, and you’re always in control over which sites have access to it—including your e-mail and mailing addresses. And, when you sign out, all of your Passport-related personal information is deleted from the computer, which means it’s safe to use on public or shared computers, too.
The Passport wallet is much like the wallet you carry around in your back pocket or your purse. When you enter a retail shop and you see something you want to buy, you pull out your wallet and choose the appropriate credit card and hand it to the merchant. After the merchant authorizes your card, you get the merchandise, and you're on your way. Your Passport wallet works in a similar way when you shop online, and you can use it at a growing number of online merchants. In your Passport wallet, you can store as many credit cards and shipping addresses as you want, safely and securely. When you make an online purchase, you choose which card and shipping address you want to use, and you send only that information to the online merchant over a secure connection. The online merchant then uses the information to authorize and deliver your purchase. Because your credit card and address information is stored safely in your wallet, you won’t have to retype it every time you make an online purchase, making your online purchases safe and fast.