Hi,
Answers as requested:
- Microsoft 365 includes Outlook 365 as a product.
- Outlook 365 and Outlook Classic are the same products. Names are used interchangebly.
- Outlook New is the new Outlook replacing the Mail and Calendar apps on Windows 10, and also the one Microsoft pushes in Classic Outlook very often.
- The classic Outlook and 365 Outlook should show this in File > Accounts:
5:
Click Outlook options > Mail > Editor Options to open Proofing menu:
- To add a Proofing language:
Select File → Options.
• Go to Language.
• Under Office authoring languages and proofing, select Add a language.
• Choose the language you want and select Add.
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, please take a moment to rate the answer. Wishing you good luck!