The OneNote app for iPhone has quickly jumped the ranks and is now the 30th most popular free app on the App Store. The app says that is free for limited time only. The other most popular note-taking app for iPhone has been the Evernote, however, OneNote definitely seems to have the edge over it.
Both the iPhone and iPad are yet to see any significant office suites except for maybe Quick Office. Microsoft’s entry into the iOS for office space will definitely give them a wider range of mobile users who prefer to do their office related work on the go. Though there is no indication whether this will lead to an office suite for iPhone, the instant success of the OneNote app might definitely prompt Microsoft to work towards creating one.
OneNote is free for a limited period only. You can download the OneNote app for your iDevice from here.