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If you try to participate in the public beta of Microsoft Security Essentials (a pre-release version of Microsoft’s non-commercial/free Anti-Virus product that replaces OneCare) outside the countries listed above then you will be blocked, unless of course you follow my links below! However be quick because it is capped at 75,000 downloads.

Go here if you live within the permitted regions, otherwise you can use this workaround to directly access the Connect site and sign-up.