Apple and Google used to compete in different markets and for awhile, both parties seemed to get along. Google CEO Eric Schmidt sits on Apple’s board, and Apple has a partnership with Google, which provides a search engine box on Apple’s Safari browser.

Now it’s starting to get fuzzy. Google has its own browser, Chrome, which competes with Safari for market share. Google also has a mobile operating system, Android, which is being used on mobile devices that challenge Apple’s iPhone.

The mobile software market is considered the next big revenue opportunity. Some speculate that Apple, a clear innovator in this category, may build its own search engine likely for a better mobile experience.