Comparing Microsoft Office Proofing Tools Across Versions: 2016, 2019, and 365

Troubleshooting Microsoft Office Proofing Tools: Common Issues & Fixes

Microsoft Office proofing tools (spellcheck, grammar, thesaurus, and language packs) can fail or behave unexpectedly for several reasons. Below are common problems and step-by-step fixes you can apply on Windows and macOS.

1. Spellcheck not working in Word/Outlook

Common causes: proofing disabled, language mismatch, file set to “Do not check spelling or grammar.”

Fixes:

1. Enable proofing: File > Options > Proofing — ensure Check spelling as you type and Mark grammar errors as you type are checked.
2. Remove “Do not check” flag: Select all (Ctrl+A / Cmd+A) → Review tab → Language → Set Proofing Language → uncheck Do not check spelling or grammar → OK.
3. Check language: Review > Language > Set Proofing Language — select correct language and ensure it matches your keyboard/input locale.
4. Restart app: Close all Office apps, reopen the document.
5. Repair Office (Windows): Settings > Apps > Microsoft 365 > Modify > Quick Repair (try Online Repair if unresolved).
6. Update Office: File > Account > Update Options > Update Now.

2. Grammar and Editor suggestions missing or limited

Common causes: Editor feature turned off, limited subscription features, or document type (plain text) lacks rich editing support.

Fixes:

1. Enable Editor features: Review > Editor — run a full Editor check.
2. Check subscription: Some advanced Editor insights require Microsoft 365. Verify your plan under File > Account.
3. File format: Save in .docx/.doc format (not plain .txt) to enable full grammar suggestions.
4. Language & region: Ensure proofing language is set and Office language preferences match (File > Options > Language).

3. Proofing Tools for additional languages unavailable

Common causes: language pack not installed, proofing tools not enabled for that language.

Fixes:

1. Install language accessory pack: Download the Microsoft Language Accessory Pack for your Office version from Microsoft’s site and install the needed language.
2. Add editing languages: File > Options > Language — under Office authoring languages and proofing, add the language and click Install if prompted.
3. Set proofing language for text: Select text → Review > Language → Set Proofing Language → choose language and confirm.

4. Custom dictionary not saving or missing entries

Common causes: permissions issues, multiple dictionaries, or corrupted custom dictionary file.

Fixes:

1. Check dictionary location: File > Options > Proofing > Custom Dictionaries — note path and ensure the file (usually CUSTOM.DIC) exists.
2. Set default dictionary: Select desired custom dictionary and click Change Default.
3. Repair or recreate: Close Office apps, rename CUSTOM.DIC (e.g., CUSTOM.DIC.bak) and create a new custom dictionary via the same dialog, then re-add words.
4. Permissions: Ensure your user account has write permission for the folder containing the .dic file (right-click folder > Properties > Security on Windows).

5. Thesaurus not showing synonyms

Common causes: language mismatch, offline/limited features, or corrupted Office cache.

Fixes:

1. Check proofing language: Thesaurus follows the proofing language (Review > Language).
2. Use Review > Thesaurus (Shift+F7): If empty, try selecting a different word or language.
3. Clear Office cache (Windows): Close Office apps, delete contents of %localappdata%\Microsoft\Office\16.0\OfficeFileCache (version folder may differ), then reopen.
4. Repair Office (see step 1.5).

6. Proofing Tools giving false positives or incorrect suggestions

Common causes: outdated proofing dictionaries, custom dictionary conflicts, or nonstandard terminology.

Fixes:

1. Add correct words to custom dictionary: Right-click the flagged word → Add to Dictionary.
2. Exclude specific terms: Use AutoCorrect or custom dictionary entries to prevent incorrect corrections.
3. Update Office to ensure latest proofing dictionaries.

7. Shared documents show inconsistent proofing behavior

Common causes: differing language settings between collaborators or tracked changes affecting selection.

Fixes:

1. Normalize language: Agree on a document language and set it across the document (Ctrl+A → Set Proofing Language).
2. Accept/Reject tracked changes: Review tracked changes; accept to ensure proofing applies consistently.
3. Ensure same proofing packs installed on each collaborator’s machine.

8. macOS-specific issues

Common causes: macOS system spellcheck overrides, Office permissions, or language pack gaps.

Fixes:

1. Check macOS system settings: System Settings > Keyboard > Text — toggle “Correct spelling automatically” as desired.
2. Office > Preferences > Spelling & Grammar: Ensure options are enabled.
3. Language settings: Tools > Language in Office apps to set proofing language.
4. Reinstall Office if problems persist.

When to contact support

• After trying the above you still see problems across multiple documents and apps.
• Proofing tools for a licensed language pack fail to install.
• Custom dictionary files are corrupted and cannot be recreated.

Provide these details when contacting support:

• Office version and build (File > Account)
• OS and version
• Exact steps to reproduce
• Sample document (if possible)

Shortcut commands

• Run spellcheck: F7
• Thesaurus: Shift+F7
• Select all: Ctrl+A (Cmd+A on Mac)

If you want, I can generate step-by-step screenshots or a short checklist tailored to your Office version (Windows or macOS).