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Hello Chaiphat! My name is Mostafa, and I’m an independent advisor and a long-time Microsoft user.
I’m sorry that you are experiencing this issue, and I will try my best to assist you with this so that you find a satisfactory solution.
- Check language settings in Windows and Outlook.
- Check file encoding format. Try changing it to UTF-8.
- Disable Protected View in Outlook.
- Check for updates for Outlook and Windows.
If these solutions don’t work, try to repair your Office installation.
I hope the above steps helped you. In case of additional questions, reach out back to me, and I will be happy to help and try my best to resolve your issue. Thank you.
Best,
Mostafa
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.