How to reinstall Outlook.

Reinstall the free new Outlook for Windows from Microsoft Store; you do not need to reinstall the Microsoft 365 desktop suite.

Reinstall new Outlook

1. Open Start and select Microsoft Store.
2. Search for Outlook for Windows.
3. Select the app published by Microsoft Corporation.
4. Select Get or Install. If the button says Open, Outlook is already installed.
5. Open Outlook and follow the prompts to add your email account if it is not restored automatically. ^1^

New Outlook requires Windows 10 version 1809 (build 17763) or later and an internet connection. ^2^

Microsoft 365 Basic is not the package used to reinstall this app: new Outlook is a separate Windows Store app, rather than classic Outlook installed as part of an Office desktop suite. ^3^

If Microsoft Store installation fails

Open Windows Terminal:

1. Press Windows+X.
2. Select Terminal.
3. Run:

winget install -i -e --id=9NRX63209R7B --source=msstore --accept-package-agreements

This installs the Microsoft Store version of new Outlook. ^4^

After installation, search the Start menu for Outlook (new), launch it, and sign in with the email account you want to use.

References

1. Outlook for Windows not responding, hangs, freezes, or stops working | Microsoft Support
2. Plan your migration to new Outlook for Windows
3. RE-DOWNLOAD MS-365 PERSONAL TO NEW SYSTEM - Microsoft Q&A
4. Resolve installation issues in the new Outlook for Windows