How to Fix OneNote for Mac Not Opening After Deleting Cache Files
Question details
OneNote for Mac fails to launch after the deletion of .bin cache files, and a standard reinstallation does not resolve the problem.
- Product
- Microsoft OneNote
- Device & OS
- macOS
- Scenario
- The user attempted to free up space or troubleshoot by deleting .bin cache files, which inadvertently corrupted OneNote's required data structure.
- Observed behavior
- OneNote stops opening entirely. Standard uninstallation and reinstallation methods fail to fix the crashing issue because residual corrupted data files remain on the Mac.
Before proceeding, check your Mac's Trash to see if the deleted .bin files are still there. Do not empty the Trash, as restoring these files is the easiest way to fix the issue.
Restore the Deleted Cache Files from the Mac Trash
The fastest way to fix OneNote if it stops opening immediately after deleting .bin files is to restore those exact files from your Mac's Trash.
When .bin files related to OneNote are deleted, the application loses access to critical temporary data needed for launch. Restoring them reverses this damage instantly.
Click on the Trash icon located at the right end of your Mac's Dock to view recently deleted items.
Look through the list of items for the recently deleted .bin cache files that belong to Microsoft Office or OneNote.
Right-click (or Control-click) on the deleted files and select 'Put Back' from the context menu. This will return them to their original hidden cache folders.
Once the files have been successfully restored, try opening OneNote again from your Applications folder or Launchpad.
Perform a Clean Reinstallation of Microsoft OneNote
If the cache files were permanently deleted and cannot be restored, you must completely remove OneNote and its background container folders before reinstalling.
Try WPS Office for a Reliable Mac Experience
If Microsoft Office applications like OneNote continue to crash or require complex troubleshooting, consider switching to WPS Office. It provides a lightweight, highly compatible alternative that runs smoothly on macOS without heavy background cache dependencies.
- 1. Download WPS Office: Visit the official WPS website and download the macOS installation package.
- 2. Install on your Mac: Open the downloaded setup file and drag the WPS Office icon into your Applications folder.
- 3. Launch and use: Open WPS Office from your Launchpad to start creating and editing your documents immediately.
Frequently Asked Questions
Why does OneNote for Mac use .bin cache files?
OneNote uses .bin cache files to store temporary data and sync changes locally before uploading them to OneDrive. This helps the app run smoothly offline, but deleting them improperly can corrupt the application data.
Will I lose my notes if I permanently delete the OneNote cache?
If your notes were fully synced to OneDrive before the cache was deleted, they are safe in the cloud and will download again upon sign-in. However, any recent offline changes that had not yet synced will likely be lost.
How can I tell if the deleted files affected other Office apps?
Try launching Microsoft Word, Excel, or PowerPoint. If these applications open without any errors, the deleted cache files were isolated to OneNote. If they also crash, you may have deleted shared Microsoft Office data files.
