While the news is primarily about Microsoft's product, Apple stands to benefit indirectly as the host platform for the iOS version of Copilot. Increased app downloads and usage on iOS devices can lead to higher revenue from the App Store, including potential in-app purchases or subscriptions processed through Apple's platform.

Google, similar to Apple, may benefit from Microsoft's Copilot app being available on Android. The presence of Copilot on the Google Play Store could attract more users and increase transaction volumes, which would be beneficial for Google's app marketplace revenue.

The release of Copilot for mobile devices directly involves Microsoft and is likely to have a positive impact on the company's software ecosystem. By expanding to popular mobile platforms, Microsoft can tap into a larger user base, which could lead to increased revenue streams from the app itself or related services. The announcement is significant for investors as it shows Microsoft's commitment to competing in the mobile productivity space.