|Bing to Index Content from iOS, Android, and Windows Apps : eAskme|
Usually content on mobile apps is not searchable, indexable or crawlable outside of the app. Even Google is limited to Android apps only to index mobile app content.
Bing want to provide you the mobile app results in search results no matter which device you use. Bing calls this App Linking, and announced how SEOs can take advantage of this:
It is the best time to apply markup now. Bing is already crawling App Links. Till now Bing has not cleared when it is going to launch app content indexing but we can expect it soon.