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How can I open Mozilla Thunderbird in Firefox 4?

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I've already set Thunderbird as my default mail service both on my system and in firefox "mailto" action. When I click the mail button in Firefox it still opens into Hotmail. My OS is Windows 7.

I've already set Thunderbird as my default mail service both on my system and in firefox "mailto" action. When I click the mail button in Firefox it still opens into Hotmail. My OS is Windows 7.

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