Why there’s no 64-bit Silverlight from Microsoft… yet
The move to 64-bit software has been steady (if slow), but browsers are in their own category entirely. Microsoft has been offering a 64-bit version of Internet Explorer (IE6 and up) since the release of the 64-bit versions of Windows XP and Windows Server 2003 in April 2005

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Why there’s no 64-bit Silverlight from Microsoft… yet
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