Earlier, Apple refused to support 32-bit applications in new versions of iOS. After the first versions of Android P appear, users may not be able to work with some old applications under Android. Google Play has already warned that from the end of 2018, only applications with an API level that corresponds to the current and previous version of Android will be added to the store. Therefore, with the release of the final version of Android P, the application must support at least Android 8.0 Oreo and contain the appropriate libraries. From August 2019, the application will have to have a 64-bit version (at the request of the developer, there may be a 32-bit version intended for older devices). After the introduction of Android P, each next version of the platform will have a minimum supported API level. The ninth version of Android will work with applications with a 17th level API that corresponds to the version of Android 4.2 Jelly Bean. Applications created for Android 4.1 and not updated after that, Android P will perceive it as outdated. In the case when the old applications are not updated, they will not be able to take advantage of the new features introduced in new versions of Android. So Android 6.0 Marshmallow has improved permission management, but this function does not work in legacy applications. The Doze mode, designed to reduce standby power consumption, does not perform its functions in older applications. With an increase in the lag in the API level, the possibility of failure of some functions, decrease in gadget performance and security increases. [Center] / center] Currently, the Android P version for developers only notifies the user that the application is out of date, but it still allows you to work with it . At the same time, the technical description indicates that applications with a lower API are not installed and do not start. It is hoped that there are very few applications that have not been updated for 6 years, and by the time the final Android P is released, there may not be any left at all. At the same time, according to Google data for February, the latest version of Android, 8 Oreo, is installed only on 1.1 % of mobile devices, Nougat – by 28.5%, Marshmallow – 28.1%. As owners of smartphones with older Androids, updating their applications designed for more modern versions of the operating system is not specified.