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Office for Mac Issues

How to Fix Spell Check Not Working in Outlook Replies on Mac

Huda QurayshiHuda Qurayshi Oct 12, 2026 869 views

Question details

The user is experiencing an issue where Outlook for Mac checks spelling in new emails but fails to do so when replying to messages.

How to Fix Spell Check Not Working in Outlook Replies on Mac
Product
Microsoft Outlook for Mac
Device & OS
Mac
Scenario
Replying to emails in Outlook for Mac.
Observed behavior
Spell check functions correctly in new messages but is inactive or unresponsive when composing a reply, even after basic restarts and settings reviews.
Before you start

Ensure your macOS and Microsoft Outlook applications are updated to the latest versions, as outdated software can cause localized feature glitches.

Solution 1Recommended

Use the Outlook Reset Preferences Tool for Mac

Resetting Outlook preferences can clear corrupted background settings that prevent spell check from running during email replies.

Sometimes, Microsoft Outlook's preference files become corrupted, causing specific features like spell check to behave inconsistently between new drafts and replies.

1
Download the Reset Tool

Navigate to the official Microsoft Support website and download the Outlook Reset Preferences tool for Mac.

2
Run the Utility

Open the downloaded file and run the application to reset your Outlook preferences to their default state.

3
Restart Outlook

Once the reset process finishes, restart Microsoft Outlook for Mac.

4
Re-enable Spelling Checks

Go to Outlook > Preferences > Spelling and Grammar in the top menu bar, and ensure the checking options are actively enabled.

Use the Outlook Reset Preferences Tool for Mac
Security Warning: Always ensure you are downloading utility tools directly from trusted, official Microsoft sources to avoid security risks.
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Frequently Asked Questions

Why does spell check work in new Outlook emails but not in replies?

This is often caused by a glitch in Outlook's preference files or formatting conflicts carried over from the original sender's email that disable the proofing tools for that specific draft.

How do I change the default spell check language in Outlook for Mac?

Go to Outlook > Preferences > Spelling & Grammar. From there, you can select your preferred default language from the Dictionary dropdown menu.

Will resetting Outlook preferences delete my emails?

No, the Outlook Reset Preferences tool only restores default application settings. It does not delete your emails, contacts, or account data.

How can I manually force a spell check in Outlook?

You can manually trigger a spell check by going to the Edit menu, selecting Spelling and Grammar, and clicking on 'Check Document' or 'Show Spelling and Grammar'.