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1. Copy and paste
http://by101fd.bay101.hotmail.msn.com/cgi-bin/BetaOptIn?page=option&curmbox=00000000%2d0000%2d0000%2d0000%2d000000000001&a=b9a426ebd4880ad9d14db4b4c55a69f8bb8dea2282102422220030b2b6bb98c8
link in your browser (Only IE supported)
2. Sign in
3. It shouldn’t work, so copy again and you should get to a page where you can click on a button labeled "Participate" 4.Expanded Storage Your Mail Beta inbox will have 2GB (2 gigabytes) of storage. Enjoy!
News Source:
http://www.fatwallet.com/t/22/563163
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