Automattic, the creator of, and Windows Live are partnering to make WordPress the default blogging platform for Windows Live users after an announcement by Windows Live’s Dharmesh Mehta (pictured right) at TechCrunch Disrupt today.

The new partnership effectively kills Windows Live’s native blogging platform, Windows Live Spaces, and adds about 7 million blogs to the WordPress platform. Users will have about six months to migrate their blog over to the WordPress platform, Mehta said.

“Windows Spaces users can pack up all their stuff and migrate their blogs over to WordPress, and keep blogging on,” said Automattic CEO Toni Schneider (pictured left).

Schneider said 8.5 percent of all sites on the Web are already powered by WordPress, adding up to about 26 million currently active blogs and 250 million visitors each month. Windows Live Spaces, by comparison, has about 30 million customers, Mehta said.