Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello, and thank you for reaching out to Microsoft Q&A.
Could you please confirm whether you’re using the classic version of Outlook that comes with your Microsoft 365 subscription, or the new Outlook for Windows?
If you’re trying to reinstall the new Outlook for Windows, you can download it from the Microsoft Store here: https://apps.microsoft.com/detail/9nrx63209r7b
Select View in Store, then install the Outlook app and sign in with your account.