The Windows Live Presence API is an HTTP-based API that returns a user's presence by using JavaScript Object Notation (JSON) or an image.
You must have the following resources to use the Windows Live Presence API:
The following browsers are supported for use with the Windows Live Presence API:
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Microsoft® Internet Explorer® 6; Windows Internet Explorer 7; Windows Internet Explorer 8
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Firefox 1.5; Firefox 2.0; Firefox 3.0 on Windows
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Firefox 1.5, Firefox 2.0; Firefox 3.0 on Macintosh OS X
A user is required to have a Windows Live™ ID to enable sharing their presence through the Windows Live Presence API. This can be obtained by visiting the Windows Live Account page.