Sorry to hear about the issue - actually the limit for sections isn't 100 MB, that should be the limit for a single file. Your section can be much larger than that (close to 1 GB) if you are using SkyDrive.
So this problem is probably being caused by a single large file that is over 100 MB. If you have any such files, that removing them might cause the issue. However, you may still need to take a couple more steps before the error will go away.
NOTE: the following steps will effectively remove the earlier versions & backups, so make sure your don't need to revert to an earlier version of the notebook before you proceed.
- When you delete a page or section, we move it to the Notebook Recycle Bin, which stores the data for a few more days. You may need to delete the offending file(s) by going to (Share -> Notebook Recycle Bin -> Empty Recycle Bin).
Alternatively , you can go into the recycle bin and delete specific pages or sections if you don't want to empty everything.
- We also store versions of pages so that you can go back to an earlier version. However, this can take up extra space which might be the source of the problem. You can select Share -> Page Versions ->
Delete All Versions in this Notebook or Section to clear out old versions.
Once you've completed all these steps, please try syncing again and see if it resolves your issue.
Note: If this is a SharePoint notebook, the limits are set by each server. Please talk to your system admin to see what limits they have configured for OneNote.
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