Cannot access Outlook "access denied" since Microsoft update of Nov 12/26

Check Microsoft 365 service status first because Microsoft reports a service degradation affecting access on November 12–13, 2026; if Outlook is listed as affected, wait for Microsoft to mark the incident resolved rather than repeatedly entering or changing your password. ^1^

1. Determine whether this is the current service incident

1. Open the Microsoft Service Health Status page above.
2. Look for an active Microsoft 365 or Outlook/Exchange incident.
3. If one appears, monitor its status until it says Service restored, then close and reopen Outlook.

For work or school Microsoft 365 accounts, an administrator can see tenant-specific details at Microsoft 365 admin center → Health → Service health. Microsoft recommends checking service health before performing local troubleshooting. ^2^

Microsoft’s November 2026 Classic Outlook known-issues list does not currently identify “Access Denied” after the November 12 update as a separate Outlook update defect. Therefore, the timing alone does not establish that the Windows update damaged Outlook. ^3^

2. Test webmail after the incident is resolved

Open your email provider’s webmail in a browser.

• Webmail also says Access Denied: This is an account or service-side problem, not merely the installed Outlook program. Use the provider’s account-recovery process or contact its support. Avoid repeatedly submitting the password because that may prolong a temporary account lock.
• Webmail works normally: Your mailbox and password are working; continue with the Classic Outlook steps below.

3. Run the Classic Outlook authentication troubleshooter

Since entering the password again did not help, use the authentication diagnostic instead:

1. Close Outlook.
2. Open Start, search for Get Help, and open it.
3. Enter Outlook password problem in the search box.
4. Complete the offered Classic Outlook authentication check troubleshooter.
5. Reopen Outlook and test access.

This troubleshooter applies to Classic Outlook on Windows, not new Outlook. ^4^

4. Create a fresh Outlook profile

If webmail works but the troubleshooter does not fix Outlook:

1. Close Outlook.
2. Open Control Panel.
3. Select User Accounts → Mail → Show Profiles.
4. Select Add, enter a new profile name, and select OK.
5. Add your email account when prompted.
6. Select Prompt for a profile to be used.
7. Start Outlook and choose the new profile.

If the new profile opens the mailbox, the old Outlook profile was the local failure point. Keep the old profile until all required locally stored data is confirmed available; delete it only afterward. ^5^

5. Repair Office only if the new profile also fails

On Windows 11:

1. Right-click Start → Installed apps.
2. Find Microsoft 365 or Microsoft Office.
3. Select … → Modify.
4. Choose Online Repair → Repair.
5. Restart Windows when prompted.

Online Repair affects the entire Office installation and can take longer than Quick Repair, but it performs the more complete repair. ^6^

Do not uninstall Outlook or edit the registry at this stage. Those are unnecessary unless the service is healthy, webmail works, a fresh profile fails, and Online Repair also fails.

References

1. Service Health Status - Microsoft
2. How to check Microsoft 365 service health
3. Fixes or workarounds for recent issues in classic Outlook for Windows
4. Classic Outlook troubleshooters | Microsoft Support
5. Classic Outlook not responding, stuck at "Processing," stopped working, or freezes | Microsoft Support
6. [Windows 11](https://support.microsoft.com/office/lifecycle/repair-an-office-application)