Microsoft has tightened the security requirements for apps available on its online stores. The new rules are effective immediately on the Windows Store, Windows Phone Store, Office Store and Azure Marketplace. Microsoft is giving developers a maximum of 180 days from the time a vulnerability is confirmed to submit an updated app. Microsoft has the right to pull apps from its stores, but it is unlikely to do so very often under the generous timeline. Microsoft competes with Apple and Google for mobile app developers, with roughly 150,000 apps in its Windows Phone store.”]