How can I add more than 3 spelling check languages in the new outlook

Question

Hello.

In my day-to-day working, I need to write in up to 4 different languages and Outlook does still not support to manage more than 3 languages.

I see there was a similar request about this topic in April 2024.

https://learn.microsoft.com/en-us/answers/questions/4614254/how-can-i-add-more-than-3-spelling-check-languages

The response to the question mentioned that this concern should have been raised to the Product Team.

Did you reach to do something after almost 2 years ?

Many thanks in advance for your feedback.

Answer 1

Hi @Auberson, Thierry

Thank you for posting your question in the Microsoft Q&A forum.    

I understand why this is frustrating, especially given how long this limitation has existed and how important multi‑language support is for your daily work. After raising the same concern over a long period of time, it’s completely reasonable to feel disappointed that this still hasn’t changed. 

Currently, new Outlook supports spell‑checking for up to three languages only. This differs from classic Outlook, which offered broader language support. The new Outlook is still being developed and updated gradually, and not all features from the classic experience are available yet. Some enhancements are added over time based on development progress and overall demand. So, the most reliable solution right now is to switch back to Classic Outlook using the toggle in the top-right corner as classic version remains fully equipped to handle complex multi-language requirements. 

If this behavior does not meet your requirements and support for more than three spell‑check languages would be beneficial, as Microsoft user I highly suggest submitting your idea via the Ideas · Community platform. This allows others to see and upvote your suggestion and helps our product development team better understand user needs and prioritize improvements. The more voices they hear, the greater the chance we’ll see enhancements in future updates.    

Please note that as forum moderators, we are not directly involved in product design decisions and do not have access to the development roadmap. However, we want to assure you that your feedback has been acknowledged and is truly valued.    

I apologize for the inconvenience this have caused you and thank you for your understanding and feedback.    

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Answer 2

New Outlook for Windows is still limited to three simultaneous proofing (spell check) languages. The provided documentation and Q&A content only describe how to:

• Add and configure proofing languages in Office/Outlook
• Enable automatic language detection
• Troubleshoot spell check issues in multiple languages

None of the referenced material indicates that the three‑language limit for spell checking in the new Outlook has been removed or expanded, nor does it document any product change from the earlier behavior.

To work with multiple languages today, the supported options remain:

1. Configure the available authoring/proofing languages in Office (including Outlook) via Review → Language → Language Preferences and by adding the necessary language packs and proofing tools.
2. Use Detect language automatically where available so Outlook can switch proofing based on the text being typed.
3. Adjust Windows (or macOS) language and keyboard settings to help Outlook pick up the correct proofing language.

For changes beyond the documented behavior (such as increasing the limit beyond three languages), the only path is through product feedback channels; no official documentation in the provided context confirms that such a change has been implemented.

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References:

• Set up or change the languages used to check spelling and grammar
• Troubleshoot checking spelling and grammar in multiple languages
• Check spelling and grammar in a different language
• Add an editing or authoring language or set language preferences in Office
• Let Outlook for Mac automatically detect and spell check languages in your emails