OneNote

I give OneNote a 9 because of how accessible it is for myself and my team members. I really like the ability to access OneNote whenever I am working remotely.

OneNote has a sound support system. I have hardly faced issues with it.

I honestly have not had to deal with support but based on my experience with Office 365 I have not had any problems getting answers when something hasn't worked properly.

OneNote is widely used so that there is a lot of helpful content that can be found for support by simply conducting web searches.
Microsoft has been receptive to product feedback provided through https://onenote.uservoice.com/, including making the decision to continue to provide mainstream support for OneNote 2016 through 2023 (https://techcommunity.microsoft.com/t5/Office-365-Blog/Your-OneNote/ba-p/954922).

Since it is part of Microsoft Office and used across the globe there are a lot of support options available. It's quickest to just do a google search which will have plenty of articles to help you since there are so many OneNote users but as an Office customer you also have access to Microsoft support and I have had good experiences with their support (probably because I'm with a large company who is a large customer to them).

I am able to find the answer to any OneNote question I have on the Microsoft support site.

The support for OneNote seems to be relatively high. I think that as more companies fully leverage Office 365 they will start using OneNote to help them with business documents. I think that more marketing dollars could go towards OneNote making more people aware of it and all that it can do for businesses.

OneNote is a Microsoft product, and as such, they have a great customer support network. Their FAQ is quite useful for answering any general questions you may have, as well as the built-in "Help" section found in the toolbar. If you are really struggling you can send a message to customer support, but I can't attest to that as I haven't done so.

OneNote has decent support, but it doesn't seem like there is a lot of information on how to achieve certain results. The built-in information is more than enough to support the average user's requirements, but for the very advanced features, it will take some experimenting to get the desired result. Microsoft doesn't seem to offer too much help in that regard, but what they offer out of the box is sufficient.