You open a Word document, find comments you carefully inserted have vanished after saving. This occurs when the document is in Compatibility Mode, a state that limits features to match older Word versions. Comments can disappear because Compatibility Mode converts or discards newer comment types that the older format does not support. This article explains why this happens and provides step-by-step fixes to preserve your comments.
Key Takeaways: Preserve Comments in Compatibility Mode Documents
- File > Info > Convert: Permanently upgrades the document to the current Word format, preserving all comment types.
- File > Save As > Word Document (.docx): Creates a new copy in the modern format, retaining comments without altering the original.
- File > Options > Trust Center > Trust Center Settings > File Block Settings: Prevents Word from opening old formats that force Compatibility Mode, avoiding comment loss.
Why Comments Vanish in Compatibility Mode
Word documents created in versions older than Word 2007 use the .doc file format. When you open such a document in Word 2019, 2021, or Microsoft 365, Word automatically enables Compatibility Mode. This mode disables newer features, including modern comment types such as threaded replies and resolved states.
In Compatibility Mode, Word stores comments in a simplified structure. If you add a threaded reply or resolve a comment while the document is in Compatibility Mode, Word might discard that data on save because the old .doc format has no field for it. The same issue occurs when you save a .docx file manually set to Compatibility Mode via File > Save As > Word 97-2003 Document (.doc).
The root cause is the format mismatch. The .doc format supports only one comment per location with a single author and timestamp. Modern features like nested replies or resolved annotations cannot be stored. Word silently strips them to make the file compatible.
Compatibility Mode Indicators
Look for the text Compatibility Mode in the title bar next to the file name. If you see it, the document is using an older format. Check the file extension in File Explorer: .doc indicates an old format; .docx indicates the modern format but may still be in Compatibility Mode if the document was saved with compatibility settings enabled.
Steps to Recover Lost Comments and Prevent Future Loss
Use one of the following methods to fix the issue. Choose the method based on whether you want to upgrade the original file or keep a copy in the old format.
Method 1: Convert the Document to the Current Format
This permanently upgrades the document to .docx and disables Compatibility Mode. All existing and future comments remain intact.
- Open the document in Word
Double-click the file. If prompted, click Yes to confirm opening. Check the title bar for Compatibility Mode. - Go to File > Info
Click the File tab, then Info in the left pane. - Click Convert
In the Info pane, locate the Convert button. It appears only when the document is in Compatibility Mode. Click it. - Confirm the conversion
A dialog box explains that the document will be upgraded to the newest format. Click OK. Word converts the file and removes Compatibility Mode from the title bar. - Save the document
Press Ctrl+S or click the Save icon. The file extension changes to .docx automatically.
Method 2: Save a Copy in the Modern Format
This method keeps the original .doc file unchanged while creating a new .docx copy with all comments preserved.
- Open the document
Double-click the file to open it in Word. - Click File > Save As
Select Save As from the File menu. - Choose Word Document (.docx)
In the Save as type dropdown, select Word Document (docx). Do not choose Word 97-2003 Document. - Name and save the file
Enter a new file name to avoid overwriting the original. Click Save. The new .docx file opens without Compatibility Mode. - Verify comments
Go to the Review tab and click Show Comments. All comments should appear. If some are missing, restore them from the original .doc file using the Undo command before saving.
Method 3: Disable File Blocking for Old Formats
Word can block opening .doc files in Protected View, which forces Compatibility Mode. Disabling this block lets you open the file in the modern format directly.
- Open Word Options
Click File > Options. - Go to Trust Center
In the left pane, click Trust Center, then click Trust Center Settings. - Select File Block Settings
In the left pane of the Trust Center, click File Block Settings. - Unblock .doc files
Find Word 97-2003 documents and templates. Uncheck Open. Click OK twice to close both dialog boxes. - Restart Word and open the file
Close and reopen Word. Open the .doc file. It now opens in the current format, not Compatibility Mode. Save it as .docx to keep comments.
If Comments Still Disappear After the Main Fix
Comments Were Added After Conversion but Not Saved
If you converted the document but then added comments and saved as .doc again, those new comments may vanish. Always save as .docx after conversion. To recover, open the .docx version from your recent files list. If you saved over the .docx with a .doc, use File > Info > Manage Document > Recover Unsaved Documents to find a backup copy.
Threaded Replies Are Missing in the .docx Copy
Threaded replies require the modern .docx format. If you opened a .doc file, added replies, then saved as .docx without converting first, the replies may be lost. To prevent this, always convert the document (Method 1) before adding any replies. If replies are already missing, undo the last save by pressing Ctrl+Z immediately after saving, then convert the file and re-add replies.
Resolved Comments Show as Regular Comments
Compatibility Mode does not support the Resolve button. If you resolve a comment in Compatibility Mode and save, the resolved state is lost. After conversion, unresolved comments appear as normal. To keep resolved states, convert the document first, then resolve comments. Use Review > Show Comments > Resolved to filter them.
Comparison of Methods to Preserve Comments in Compatibility Mode
| Item | Convert (Method 1) | Save As .docx (Method 2) | Disable File Blocking (Method 3) |
|---|---|---|---|
| What it does | Upgrades the original file to .docx permanently | Creates a new .docx copy, keeps original .doc | Opens .doc files without Compatibility Mode |
| Preserves threaded replies | Yes | Yes | Yes |
| Preserves resolved state | Yes | Yes | Yes |
| Requires saving as .docx | Automatic | Manual | Manual |
| Best for | Single file you own | Files you must keep in .doc format | Frequent .doc files from colleagues |
You can now recover missing comments and prevent future loss by converting the document to the modern format or saving a .docx copy. After conversion, use the Review > New Comment button to add threaded replies and the Resolve button to mark them as resolved. For documents you receive regularly, configure File Block Settings to open .doc files without Compatibility Mode. This keeps all comment features active from the start.