Each of the notebooks have digital sections and pages for organizing thoughts, as opposed to Evernote, which focuses more on dumping notes into notebooks in a less structured manner. One of the major differences between OneNote and Evernote is that OneNote is grounded in the physical concept of a notebook.

It's not clear how many users that adds up to, or how many of those people have chosen to switch from Evernote to OneNote full-time. Users have imported 71 million Evernote pages into OneNote since then, Microsoft said. The Mac importer comes after Microsoft launched a similar importer for Windows last March.

Now, Microsoft operates it as a free service, and even introduces new features first to client apps that aren't on Windows. OneNote was previously only available for desktop computers on Windows to paying customers of Microsoft Office. The move is emblematic of a bunch of shifts within Microsoft over the tenure of CEO Satya Nadella. The importer requires users to run OS X El Capitan, the latest version of Apple's operating system, and have all of the Evernote files they want to import already sitting on their computers.

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