Using classic Outlook for Windows in business environments
Dear TC123DH
Thanks for using Microsoft products and posting in the community.
For the classic version of outlook to switch from Spanish to English, you first make sure that these three parameters are displayed correctly:
- the Window system language is set to English.
- Confirm that it is English in Outlook client: click File - Options - Language - find English, confirm that they are all in English, then click Confirm and reopen outlook.
If it still doesn't work, you can also try to get the corresponding language accessory package from the following link and install it to see the effect:
Language Accessory Pack for Microsoft 365 - Microsoft Support
I hope the above information can help you.
Looking forward to your reply.
Best wishes
Clark | Microsoft Community Support Specialist