Outlook Keeps Asking for Password

Editorial Team·1 months ago

019513 minutes read

Quick answer: Outlook keeps asking for password most often because a corrupted credential is stored in Windows Credential Manager, a password was recently changed, or multi-factor authentication requires a modern authentication flow that the current Outlook version does not support. Clearing the stored credential in Credential Manager and re-entering the correct password resolves the majority of cases.

"Outlook Keeps Popping Up a Password Box" — Why It Happens and How to Make It Stop

A situation that comes up regularly in both personal and corporate email use: Outlook opens and immediately displays a password prompt. The correct password is entered, the prompt disappears — and then it comes back a few minutes later, or the next time Outlook is opened, or every time a new email is sent. The repeated password prompt is one of the most common Outlook issues reported by users, and it is particularly frustrating because entering the correct password does not fix it. The problem is almost never the password itself — it is usually a stored credential that has become corrupted or outdated, or an authentication configuration that needs to be updated. This guide covers the most common causes of Outlook keeps asking for password on Windows, Mac, and mobile, and the steps to fix each one. The specific steps vary by Outlook version, operating system, and whether the account is a personal Microsoft account, a Microsoft 365 business account, or a third-party email account (Gmail, Yahoo, etc.) configured in Outlook. The troubleshooting logic applies broadly, but the exact menu paths may differ depending on the Outlook version in use.

Why Outlook Keeps Prompting for a Password — The Root Causes

Outlook stores email account credentials locally so that users do not need to enter their password every time the application opens. On Windows, these credentials are stored in Windows Credential Manager. On Mac, they are stored in the macOS Keychain. When the stored credential becomes corrupted, outdated, or mismatched with the current account password, Outlook cannot authenticate silently and falls back to prompting the user for a password. Entering the correct password at the prompt may work temporarily, but if the corrupted credential is not removed, Outlook may revert to using it and prompt again. Password changes are a common trigger. When an email account password is changed — through the provider's web interface, by an IT administrator, or through an organization's password rotation policy — the stored credential in Credential Manager or Keychain still contains the old password. Outlook attempts to authenticate with the old credential, fails, and prompts for the password. Even after the correct new password is entered at the prompt, if the old credential is not removed, Outlook may continue to use it intermittently. Multi-factor authentication (MFA) adds another dimension. When MFA is enabled on a Microsoft 365 or Exchange account, Outlook needs to use a modern authentication flow (OAuth) rather than basic authentication (username and password). Older versions of Outlook, or Outlook configured for basic authentication, cannot complete the MFA challenge and enter a password prompt loop. This is increasingly common as organizations enable MFA as a security requirement.

Outlook Keeps Asking for Password — 5 Common Causes and Fixes

ProblemCauseFixPassword prompt on every openCorrupted stored credentialClear Credential Manager / KeychainPrompt after password changeOld credential still storedRemove old entry, re-enter new passwordMFA prompt loopBasic auth / outdated OutlookUpdate Outlook; enable modern authPrompt for specific account onlyCorrupted Outlook profileRemove and re-add the accountPrompt after Windows updateCredential store cleared by updateRe-enter credentials; check Remember option

1. Corrupted Credential in Windows Credential Manager

The most common cause of repeated Outlook password prompts on Windows is a corrupted or duplicated credential stored in Windows Credential Manager. Credential Manager is the Windows system that stores usernames and passwords for applications and websites. When Outlook's stored credential becomes corrupted — which can happen after a Windows update, an Outlook update, or a network change — Outlook cannot use it to authenticate silently and falls back to prompting the user. To fix this, open Credential Manager by searching for it in the Windows Start menu. Go to the "Windows Credentials" tab and look for entries that contain "MicrosoftOffice," "Microsoft_OC," "Outlook," or the email address of the affected account. Remove all entries related to the affected account. Then restart Outlook — it will prompt for the password once, and after entering the correct password, it should store a fresh credential and stop prompting. If the option "Remember my credentials" or "Remember password" appears in the prompt, enabling it ensures the credential is stored for future sessions.

2. Password Was Recently Changed

When an email account password is changed, the stored credential in Credential Manager still contains the old password. Outlook attempts to authenticate with the old credential, fails, and prompts for the password. Even if the correct new password is entered at the prompt, Outlook may revert to the old stored credential on the next session if the old entry is not removed. This is particularly common in corporate environments where password rotation policies require regular password changes. The fix is the same as for a corrupted credential: open Credential Manager, remove all entries related to the affected account, restart Outlook, and enter the new password when prompted. Alternatively, update the password directly in Outlook's account settings: go to File > Account Settings > Account Settings, select the affected account, click Change, and update the password field. For Microsoft 365 accounts using modern authentication, the password update may need to be done through the Microsoft account sign-in flow rather than the account settings dialog.

3. Multi-Factor Authentication Requiring Modern Authentication

When MFA is enabled on a Microsoft 365 or Exchange account, Outlook must use OAuth-based modern authentication to complete the sign-in process. Older versions of Outlook (generally Outlook 2013 and earlier, and some configurations of Outlook 2016) use basic authentication by default and cannot complete the MFA challenge — the result is a password prompt loop that cannot be resolved by entering the password, because the MFA step is never reached. This is increasingly common as organizations enable MFA as a security requirement for Microsoft 365 accounts. The fix requires two steps: first, ensure Outlook is updated to a version that supports modern authentication (Outlook 2016 or later, with current updates applied). Second, confirm that modern authentication is enabled in the organization's Microsoft 365 admin center — an IT administrator can verify this. If Outlook is up to date and modern authentication is enabled, the password prompt should be replaced by a browser-based sign-in window that includes the MFA step. If the organization uses app passwords for legacy authentication, generating an app password from the Microsoft account security settings and using it in Outlook's account settings is an alternative approach.

4. Corrupted Outlook Profile

An Outlook profile is a configuration file that stores account settings, server information, and cached data for one or more email accounts. If the profile becomes corrupted — which can happen after an abrupt application close, a disk error, or an interrupted update — Outlook may be unable to authenticate the account correctly, resulting in repeated password prompts for a specific account even when other accounts in the same Outlook installation work normally. To diagnose a corrupted profile, create a new Outlook profile: go to Control Panel > Mail > Show Profiles > Add, create a new profile, and add the affected email account to it. If the account works correctly in the new profile without repeated password prompts, the original profile was corrupted. The new profile can be set as the default, and the old profile can be removed. Note that creating a new profile requires reconfiguring any additional accounts, rules, or settings that were in the original profile.

5. Outlook Version or Windows Update Cleared Stored Credentials

⚠️ Worth checking after a recent update: Windows updates and Outlook updates occasionally clear stored credentials in Credential Manager as a security measure, or change the way credentials are stored in a way that invalidates existing entries. If the repeated password prompt started immediately after a Windows update or an Outlook update, this is the likely cause. The fix is straightforward: clear any remaining entries in Credential Manager for the affected account, restart Outlook, enter the password when prompted, and ensure the "Remember my credentials" option is selected. If the prompt returns after subsequent updates, checking whether the organization's IT policy is configured to clear credentials on update is worth investigating — some corporate security policies intentionally clear stored credentials periodically.

Step-by-Step: How to Fix Outlook Keeps Asking for Password

Step 1: Clear Stored Credentials in Windows Credential Manager

Open the Windows Start menu and search for "Credential Manager." Open it and click "Windows Credentials." Scroll through the list and identify any entries that contain "MicrosoftOffice," "Microsoft_OC," "Outlook," "office365," or the email address of the affected account. Click each entry to expand it, then click "Remove." Remove all entries related to the affected account — if there are multiple entries, remove all of them. After removing the entries, close Credential Manager and restart Outlook. When Outlook prompts for the password, enter the correct current password and check "Remember my credentials" if the option appears.

Step 2: Update the Password in Outlook Account Settings

If the password was recently changed, update it directly in Outlook's account settings. In Outlook on Windows, go to File > Account Settings > Account Settings. Select the affected account from the list and click "Change." In the account settings dialog, update the password field with the new password and click Next, then Finish. For Microsoft 365 accounts, the Change button may open a browser-based sign-in window rather than a password field — complete the sign-in process in the browser window, including any MFA steps if required. After updating, restart Outlook and confirm that the password prompt does not return.

Step 3: Update Outlook to the Latest Version

Ensure Outlook is updated to the latest version, particularly if MFA has been recently enabled on the account. In Outlook on Windows, go to File > Office Account > Update Options > Update Now. On Mac, go to Help > Check for Updates. After updating, restart Outlook. If the password prompt was caused by a version incompatibility with modern authentication, the update should resolve it — the next sign-in prompt should open a browser-based authentication window rather than a simple password dialog.

Step 4: Remove and Re-Add the Account in Outlook

If clearing Credential Manager and updating the password did not resolve the problem, remove the affected account from Outlook and re-add it. In Outlook on Windows, go to File > Account Settings > Account Settings, select the affected account, and click Remove. After removing the account, click New to add it again using the current email address and password. For Microsoft 365 accounts, Outlook will typically auto-configure the account settings — entering the email address and clicking Connect is usually sufficient. For third-party accounts (Gmail, Yahoo, etc.), the IMAP/SMTP server settings may need to be entered manually.

Step 5: Create a New Outlook Profile

If the problem persists after removing and re-adding the account, create a new Outlook profile. Close Outlook. Open Control Panel and search for "Mail." Click "Mail (Microsoft Outlook)" to open the Mail Setup dialog. Click "Show Profiles," then "Add" to create a new profile with a new name. Add the affected email account to the new profile. Set the new profile as the default by selecting "Always use this profile" and choosing the new profile name. Open Outlook with the new profile and confirm that the password prompt does not recur. If the account works correctly in the new profile, the original profile was corrupted and can be removed from the profile list.

Frequently Asked Questions — Outlook Keeps Asking for Password

Why does Outlook keep asking for my password?

The most common causes are a corrupted credential in Windows Credential Manager, a recently changed password that has not been updated in Outlook, multi-factor authentication requiring a modern authentication flow, or a corrupted Outlook profile. Clearing the stored credentials in Credential Manager and re-entering the correct password resolves the majority of cases on Windows.

How do I stop Outlook from asking for my password?

Open Credential Manager (search in the Start menu), go to Windows Credentials, remove all entries related to Microsoft Office or the affected email account, restart Outlook, and enter the correct password when prompted — checking "Remember my credentials" if the option appears. This clears the corrupted stored credential and allows Outlook to store a fresh one.

Does a recent password change cause Outlook to keep asking for a password?

Yes. When an email account password is changed, the old credential remains stored in Credential Manager. Outlook attempts to authenticate with the old credential, fails, and prompts for the password. Removing the old entry from Credential Manager and re-entering the new password resolves this.

Why does Outlook keep asking for a password after enabling multi-factor authentication?

When MFA is enabled, Outlook needs to use modern authentication (OAuth) rather than basic authentication. Older Outlook versions cannot complete the MFA challenge and enter a password prompt loop. Updating Outlook to the latest version and ensuring modern authentication is enabled in the organization's Microsoft 365 settings resolves MFA-related password prompt loops.

How do I fix Outlook keeps asking for password on Mac?

On Mac, open Keychain Access (Applications > Utilities > Keychain Access), search for entries related to Microsoft or Outlook, and delete any that appear outdated or duplicated. Restart Outlook and re-enter the password when prompted. If the problem persists, sign out of the Microsoft account in Outlook (Outlook > Preferences > Accounts) and sign back in.

Conclusion & My Take

Outlook keeps asking for password is almost always a credential storage or authentication configuration issue rather than a problem with the password itself. The fix in most cases is to clear the corrupted or outdated stored credential from Windows Credential Manager (or macOS Keychain on Mac) and allow Outlook to store a fresh one. If the prompt returns after clearing credentials, checking whether a password change or MFA enablement triggered the issue narrows the cause quickly. The MFA-related password prompt loop is worth highlighting because it is increasingly common as organizations enable MFA for Microsoft 365 accounts — and it is the one case where entering the correct password genuinely cannot resolve the prompt, because the authentication flow requires a step that basic authentication cannot complete. Updating Outlook and confirming that modern authentication is enabled resolves this category of issue. For organizations managing multiple users, ensuring that all Outlook installations are current before enabling MFA reduces the number of support requests significantly. Have you encountered an Outlook password prompt that was not resolved by these steps, or found a fix specific to a particular Outlook version or organization configuration? Corporate Exchange and Microsoft 365 configurations vary significantly — feel free to share your experience in the comments below.