How to Stop OneNote from Changing Mixed-Case Abbreviations
Question details
The user wants to prevent OneNote from automatically altering abbreviations that contain mixed capitalization.

- Product
- Microsoft OneNote
- Device & OS
- Windows 10
- Scenario
- Typing specific mixed-case abbreviations (such as 'ACs') in notes.
- Observed behavior
- OneNote automatically corrects the mixed-case abbreviation to a standard capitalized word (e.g., changing 'ACs' to 'Acs').
Check which version of OneNote you are using on your computer. The settings required to fix this issue are available in the standard OneNote desktop application (formerly OneNote 2016) but are missing from the deprecated OneNote for Windows 10 app.
Adjust AutoCorrect Options in OneNote Desktop
Use the standard desktop version of OneNote to disable the feature that automatically corrects two initial capitals.
The standard OneNote desktop application provides comprehensive proofing options that allow you to customize exactly how AutoCorrect behaves while you type.
Launch the OneNote desktop application. Click on the 'File' tab in the top-left corner of the window, then select 'Options' at the bottom of the menu.
In the OneNote Options dialog box, click on 'Proofing' in the left-hand sidebar, then click the 'AutoCorrect Options...' button.
In the AutoCorrect tab, locate and uncheck the box labeled 'Correct TWo INitial Capitals'.
Click 'OK' in the AutoCorrect window, and then click 'OK' again in the Options window to apply your new settings.

Switch from OneNote for Windows 10 to the Current OneNote App
Upgrade to the unified OneNote desktop app if you are stuck using the feature-limited Windows 10 version.
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Frequently Asked Questions
Why does OneNote for Windows 10 change my abbreviations?
OneNote for Windows 10 is a simplified, deprecated application that lacks the detailed AutoCorrect exception settings found in the standard desktop version, causing it to rigidly enforce standard capitalization rules.
Can I add exceptions to AutoCorrect in OneNote?
Yes, but only in the standard OneNote desktop application. You can go to File > Options > Proofing > AutoCorrect Options, and click the 'Exceptions...' button to add specific words to your exclusion list.
Is OneNote for Windows 10 being replaced?
Yes, Microsoft is consolidating its note-taking applications and recommends users transition to the main OneNote desktop application, which includes the full suite of features like advanced proofing and local backups.




