Hi,
Let me explain why this happens
Microsoft account integration: If your PC is signed in with a Microsoft account, Outlook is automatically linked for email, calendar, and syncing.
Linked apps and services: Removing Outlook without adjusting account settings can impact OneDrive, Microsoft Store, and other features.
Account type matters: If Outlook is just an added email account in the Mail app or Office, it can be removed without changing your Windows sign-in.
What you can try is:
If Outlook is only in the Mail app or Office
Open Mail app → Settings → Manage Accounts → select the Outlook account → click Delete account from this device.
If Outlook is tied to your Windows sign-in
Go to Settings → Accounts → Your info → switch to a local account first.
Then remove the Microsoft account under Settings → Accounts → Email & accounts.
For Outlook desktop app
Open Outlook → File → Account Settings → Manage Profiles → remove the account.
For Outlook.com (web)
Simply sign out or stop using the web app; no changes needed on your PC.
Let me know how it goes, Happy to help!