This morning at the Mobile World Congress in Barcelona, Microsoft bought Danger, the company behind the popular T-Mobile Sidekick’s operating system.

Danger provides the smart-phone-like software typically used most by teenagers and young hipsters, offering mobile messaging services like IM and SMS, as well as support for e-mail, gaming, Web browsing and media playing.

Also over the weekend, Microsoft announced that it would be partnering with Sony Ericsson’s Mobile Communications department to create Windows Mobile phones. The announcement is good news for anyone that’s tired of the business look and who are seeking something more unique like Sony Ericsson phones tend to be: offering, sometimes better music playback, more colors, and smaller handset sizes, typically.

“The announcement is a Windows Mobile 6 announcement and agreement. Obviously once we roll out new versions of the platform we’re always working with the OEMs to take them up at the next opportunity with the new handsets. It will come down to the timing of the different handsets as they decide to lay down on [Windows 6.1],” Brian Arbogast, corporate vice president of Microsoft told LAPTOP, “we’re certainly hoping [Sony Ericsson] will take advantage of all our platform releases as we release them,” he said. The effort was a move to bring Windows Mobile, Live Messenger, Hotmail, and Live Spaces to more handsets.

Stay tuned for our interview with Brian Arbogast, and more news from the 2008 Mobile World Congress.