Microsoft is busy making new friends with popular mobile developers, except some of the friendships seem to be entirely one-sided.

RovioMobile, the developers of the incredibly popular Angry Birds game, noticed that Microsoft put their famous apps icon on the Windows Phone 7 site – without permission and without any agreement to build the hit game for Windows Phone 7.

Oops. It looks like Microsoft has since taken the icon off of their WP7 site, perhaps they shouldn’t count their app chickens before the developer eggs hatch huh? I’m sure Windows Phone 7 will be reasonably popular and will likely even get Angry Birds onto the platform, but this is a great example of how not to build relationships with developers.

Microsoft is obviously pushing hard for Windows Phone 7 to be relevant from the start, earlier in the year it was revealed that they are directly paying mobile developers to create apps for the upcoming mobile operating system.

Thanks to Robert for sending in the tip and pictures.