Using Classic Outlook on Windows for personal email, calendar, and contact management
Hello !
This is indeed a phishing scam.
Microsoft will never send you an email to ask you to "update" Outlook.
Official Microsoft emails always have the same domain : @accountprotection.microsoft.com
If the email does not come from this domain, you can ignore it, and report it as a phishing.
You can learn more about this here : https://support.microsoft.com/en-us/account-billing/can-i-trust-email-from-the-microsoft-account-team-685fd302-f52f-1a9f-cc13-065dec46fe25
Please let me know if you have any other question !