First go to your Hotmail account and log in.
Then go to the settings (Options) of your account and click on "My Profile".
You need the adjust the country to United States and the state to Florida (postal code 33332). (it could be that other states also work)
Then go to http://memberservices.passport.net/memberservice.srf?lc%2043.
Click on the link to terminate your .NET passport. Then you need to click on the button the contact Hotmail and click on "close my account".
Close Internet Explorer and go to hotmail.com and log in again.
Normally you should have a 25MB account now. Soon it will be upgraded to 250MB!
从网上看来的一个方法,我也成功了 
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郑重声明: 本帖只代表我(做人要厚道)本人成功升级,对于在升级过程中可能带来的停止用户服务以及由此带来的其他任何影响,本人概不负责任.
