Month: June 2026

When Outlook keeps asking for your password every time you open it — or even mid-session — the cause is almost never a wrong password. The looping prompt hits Microsoft 365 and Outlook.com users constantly, and it rarely stops on its own. The first time it happened to me on a client’s laptop, I retyped the correct password four times before I realized Outlook was ignoring it entirely. The real culprit is usually a stale saved credential or a misconfigured authentication setting, not a compromised account.

Before you change your password or reinstall Office, work through the targeted fixes below. I clear most cases in under five minutes once I know which layer is actually broken.

Quick Answer

Open Windows Credential Manager (Control Panel > Credential Manager > Windows Credentials), find every entry containing “MicrosoftOffice” or your email domain, and click Remove. Restart Outlook and sign in fresh. This clears the stale authentication token behind most repeated password prompts — no password change or reinstall required.

Why does Outlook keep asking for my password?

Outlook stores an authentication token after your first sign-in and reuses it silently. When that token goes stale, duplicates, or fails to renew, Outlook can’t validate it — so it falls back to prompting you, and the prompt loops because the broken token is never replaced. On the client laptop I mentioned, three duplicate “MicrosoftOffice16” entries were fighting each other in Credential Manager; deleting all three ended the loop instantly.

A changed work password, an expired refresh token, a deprecated Basic Authentication fallback, or security software that inspects Microsoft’s login traffic can each break that renewal. The good news: every one of these is a local configuration issue you can fix yourself.

The loop is your token failing to renew, not Outlook doubting your actual password.

How do I clear stale credentials in Credential Manager?

This resolves the loop in the majority of cases and takes about two minutes. It’s the first thing I try, every time.

1. Press Win + S, type Credential Manager, and open it.
2. Click Windows Credentials.
3. Look for entries containing MicrosoftOffice, outlook, or your email domain (for example, office365 or your company name).
4. Click each entry and select Remove. Remove every matching entry — even ones that look current.
5. Restart Outlook and sign in when prompted.

If you see multiple entries for the same account, remove all of them. Duplicate tokens make Outlook cycle between credentials rather than locking onto a valid one, which is why the prompt keeps returning even after you type the correct password.

Deleting every Microsoft-related credential entry forces Outlook to mint one clean token on the next sign-in.

Is Modern Authentication enabled on your account?

Microsoft 365 accounts require Modern Authentication (OAuth 2.0). Older Outlook builds or misconfigured tenant settings can fall back to Basic Authentication — which Microsoft has deprecated and which reliably triggers repeated prompts.

1. In Outlook, go to File > Office Account > About Outlook and note your version number.
2. Build 16.0.7967 or later supports Modern Auth natively. If you’re below that, update via File > Office Account > Update Options > Update Now.
3. IT admins can confirm Modern Auth is on in the Microsoft 365 admin center under Settings > Org Settings > Modern Authentication.

One detail that burned me once: a VPN or antivirus performing SSL inspection on Microsoft’s login endpoints can silently block OAuth token renewal. Temporarily disconnect the VPN or whitelist login.microsoftonline.com in your security software, then test whether the prompt disappears. Microsoft documents this behavior in its own guidance on repeated Outlook password prompts.

If your build predates 16.0.7967 or a VPN is inspecting login traffic, the token can never renew no matter how often you sign in.

How do I create a fresh Outlook profile?

A corrupted profile stores a broken auth state that can’t be repaired in place. Building a new profile is the cleanest fix when the steps above don’t hold — I save it for stubborn cases because it takes the longest.

1. Close Outlook completely.
2. Open Control Panel > Mail (Microsoft Outlook). Search “mail” in the Start menu if it doesn’t appear in the list.
3. Click Show Profiles > Add, name the new profile, and follow the wizard to add your email account.
4. Under When starting Microsoft Outlook, use this profile, select Always use this profile and choose the new one.
5. Open Outlook. If the prompt is gone, the old profile was the culprit — delete it from the same Show Profiles dialog.

A new profile sidesteps the corrupted auth state instead of trying to repair it in place.

Can I just remove and re-add the one account?

Yes. If a full new profile feels like overkill, removing and re-adding only the affected account is a lighter alternative that often resolves single-account issues without touching your others.

1. Go to File > Account Settings > Account Settings.
2. Select the affected email account and click Remove.
3. Click New and complete the add-account wizard with your credentials.
4. Restart Outlook and confirm the prompt no longer appears.

Re-adding a single account rebuilds just that token while leaving every other mailbox untouched.

Which fix should you try first?

When more than one fix could apply, I work top to bottom — fastest and least disruptive first. This table is the order I follow.

Start with Credential Manager and only escalate to a profile rebuild if the loop survives.

Common Mistakes to Avoid

• Checking “Remember my credentials” without clearing old entries first. Outlook reads existing stored credentials before saving new ones, so stale entries block the new password from taking hold. Remove old entries first, then sign in.
• Reinstalling Office as a first step. A reinstall takes 20+ minutes and almost never fixes an auth loop unless the installation files are damaged. Start with Credential Manager and treat reinstall as a last resort.
• Changing your Microsoft account password to break the loop. If the cause is a stale token, a new password just creates a fresh mismatch and can extend the problem. Fix the token, not the password.
• Testing with a VPN still connected. VPNs that inspect Microsoft’s login traffic can stop a working fix from taking effect. Always test without the VPN before deciding a fix failed.
• Skipping “Stay signed in” during re-authentication. Selecting Stay signed in writes a long-lived refresh token; skip it and you’ll likely be prompted again within hours.

Frequently Asked Questions

Does this password loop happen on Mac too?
Yes, and the fix mirrors Windows. Open Keychain Access, search for “Microsoft,” delete any Outlook or Exchange-related entries, then reopen Outlook and sign in fresh. I cleared a colleague’s MacBook loop this way in about a minute — the stale credential cache is the same root cause as on Windows.

Why does it only affect one of my email accounts and not the others?
Each account stores its credentials separately, so one corrupted token or profile entry leaves the rest working. On my own setup, only my work account looped while a personal Outlook.com account signed in fine — removing and re-adding just the work account fixed it without disturbing the other.

Will clearing Credential Manager delete my emails?
No. Credential Manager stores authentication tokens, not message data. Your mail lives on the Microsoft 365 or Exchange server, or in a local .ost file on your drive, so a recent client of mine lost zero messages after I wiped every credential entry on their machine.

My work password changed and now Outlook loops — what’s the quickest fix?
Open Credential Manager, remove the old entry for your work email, and restart Outlook so it prompts once for the new credentials. When I hit this after a forced domain reset, signing out and back into Windows with the new password first made the single-sign-on token refresh cleanly.

Could repeated password prompts mean my account was hacked?
Rarely — it’s almost always a technical credential issue, not a breach. That said, if you also see unfamiliar login locations or sent mail you didn’t write, treat it as a security event and change your password from a trusted device. If malware is possible, run a quick scan with Malwarebytes Free before rebuilding a profile.

Conclusion

The Outlook password loop is almost always a credential cache or authentication issue — not a broken install or security breach. Clearing Windows Credential Manager takes two minutes and resolves most cases; Modern Auth and a fresh profile close the rest.

If your mailbox itself stops moving messages, see my walkthrough on when Outlook won’t send or receive email, and if sync trouble spreads across your account, the guide to why OneDrive stops syncing covers the next common issue in the same stack. Try Credential Manager first, then come back if the loop holds.