Microsoft’s latest operating system, the long awaited Windows Vista, includes a surprise for XM subscribers in the United States.

The subscription satellite radio provider today launches XM Radio Online as part of its digital music hub, delivering more than 80 radio channels, including commercial-free music, the Oprah & Friends talk and lifestyle channel, shock jocks “Opie & Anthony,” stand-up comedy, and children’s programming.

The service is free for current subscribers and new listeners can sign up for $7.99 per month, giving XM a long-term backup plan of global internet delivery of its programming.

My-Chau Nguyen, XM senior vice president for marketing programs and operations says:

“XM is pleased to be extending its strategic relationship with Microsoft with the inclusion of XM Radio Online in Windows Vista.

“By working with Microsoft, we are expanding the availability of XM Radio Online, which provides an extraordinary variety of music choices, talk radio options, and exclusive programming such as ‘Oprah & Friends.’

“The integration of XM Radio Online further enhances the music and entertainment experience offered by Windows Vista.”

Australian retailer Sanity has announced a local agreement for music sales within the new operating system, going head-to-head with Apple’s iTunes Music store.