New Outlook AutoCorrect is unreliable. If you type fast or rely on custom AutoCorrect entries, you have seen the frustration. Your entries exist, Outlook confirms them, and then Outlook ignores them.
This issue is not your fault. The design of New Outlook causes these failures. This guide explains why AutoCorrect breaks and how to reduce the problem.
Why New Outlook AutoCorrect Breaks
Classic Outlook used the same AutoCorrect engine as Microsoft Word. New Outlook does not. New Outlook uses:
- Windows Spellcheck
- Cloud-based prediction
- A partial Word editor
This new editor does not fully support the classic AutoCorrect system.
That is why:
- Your AutoCorrect entries appear in the list
- Outlook alerts you that the entry already exists
- The correction does not trigger when you type
Transposition mistakes like “whihc → which” fail most often. Those entries depend on older AutoCorrect logic that New Outlook has not completed.
You can try the following solutions.
Fix 1: Add the AutoCorrect entry in Microsoft Word
This is the most reliable fix. Word remains the primary source for AutoCorrect across Microsoft apps.
Open Word
Select File → Options → Proofing → AutoCorrect Options
Add your correction
Quit Outlook and restart it
New Outlook pulls AutoCorrect data from Word more consistently than from its own internal list.
Fix 2: Add the entry in both Word AutoCorrect lists
Inside Word’s AutoCorrect dialog:
- Add it under AutoCorrect
- Add it under Replace text as you type
New Outlook checks these lists separately.
Adding the entry to both increases your success rate.
Fix 3: Turn off Text Predictions
Text Predictions can override AutoCorrect.
If Outlook predicts text before your entry fires, your correction never appears.
Turn it off:
- Settings → Mail → Compose and reply → Text predictions → Off
This removes the conflict between prediction and AutoCorrect.
Fix 4: Fully Quit New Outlook
Closing the window is not enough.
New Outlook must be exited from the tray.
Right-click the Outlook tray icon
Select Quit
Relaunch Outlook
AutoCorrect entries refresh only after a complete restart.
New Outlook Custom Personal Dictionary
New Outlook also includes a Personal Dictionary for words that are not in the standard spell-check library. This is useful when your organization uses product names, industry terms, branded spellings, or abbreviations that Outlook flags as incorrect.
Access it by composing a new message and selecting:
Options → Editor → Personal Dictionary
Use this feature for:
- Company names
- Product names
- Brand terms
- Industry-specific vocabulary
Abbreviations
Personal Dictionary only prevents red underlines. It does not fix typos or transposition mistakes. AutoCorrect still handles those.
The personal dictionary does not apply to Outlook.com (free version users).
If New Outlook AutoCorrect Still Fails
This issue is known.
New Outlook’s editor is still under development.
The AutoCorrect system is not complete, and failures are expected.
The most common failures include:
- Common typo corrections
- Transposition fixes
- Branded phrase replacements
- Custom AutoCorrect entries
You can reduce failure frequency, but you cannot remove it entirely today.
Before You Go
The AutoCorrect failures in New Outlook are not random. They stem from the new editor and its incomplete connection to the older AutoCorrect engine.
By adding your corrections inside Word, disabling Text Predictions, using the Personal Dictionary for branded terms, and restarting Outlook, you improve reliability. These steps give you more reliable behavior while Microsoft continues rebuilding the editor.
The key point is clear:
You are not the problem. The editor still needs work.
