Equation Editor
The full equation editor for typing equations should be available in the OneNote app. I use this constantly. I would find a different alternative to OneNote altogether before switching to the Windows 10 version if this is not available.
We are happy to let you know that we have started to roll out Equation Tools feature to OneNote for Windows 10. The feature will be available to everyone in the next couple of weeks. Read more at this link: https://support.office.com/enus/article/createequationsinonenoteusingequationtools2c19d141a97c478a98c3ce388f7b6032
7 comments

Germán commented
I have been testing this function extensively (I am beta tester). It is a great improvement but it still has some errors. The "structures" section of the "recent" tab has a bug that adds strange numbers (usually 60 or 100) in front of the mathematical structure. On the other hand, the design as a side menu, added to the side navigation menu, leaves me almost no space to see the onenote page (I have a surface pro 4). I perceive a great effort on your part to keep the upper panel as clean and minimalist as possible, but I think that in the case of the equations it should go there (similar to the drawing tab, but more "wide"). In Word I can write functions much faster, since there is more space, and I can search for symbols and structures more quickly without having to change tabs; and at the same time, I can see the sheet. Tank you!

Reid Sunderland commented
I agree! The modern Windows OneNote app should have the same Equation Editor as other Office apps and the desktop OneNote. The Math function is not useful for typesetting complex equations.

Greta Gaut commented
I have taught my students a number of shortcuts to let them type in Equation Editor in the OneNote app, the lack of a menu for Equation Editor is a serious problem with the app! Not everyone is going to use the touch screen functions of ink to maths and not everyone writes well enough to make this workable. We need the option to type. Please give it back!

Peter commented
I see you can access equation editor functions by pressing alt =. You need to know the keyboard methods, e.g. x^2 for power, x_1 for subscript, \alpha space for alpha, \int space for integral sign etc.

Anonymous commented
I completely agree, my students do not have the extra focus it would take for them to learn the commands for writing equations without the equations editor. I truly hope you will add this back

Peter commented
I use Onenote in mathematics teaching. Remove the ability to properly type equations using the Office equation editor would be a big step backwards. Microsoft should be supporting education, not withdrawing useful software. Please reconsider the decision to withdraw the desktop version of Onenote.

Ayaka Sheehan commented
I completely agree, this is a crippling absence in the OneNote Windows 10 App.
In OneNote 2016, you can go to Insert > Equations and have an excellent editor.
Or Insert > Symbols and choose from accented letters, Greek letters, math/science/currency symbols, etc.For any people in STEM, being able to edit our own equations is key. For any people using a language other than English, being able to insert accented letters is key. For people talking about currency, the weather, or units like micrometers or Ohms, symbols are necessary.
When will this feature be added? Until then, I cannot switch from OneNote 2016.