How to Fix Outlook Login Loop & Reset Search Cache: Full Guide

How to Fix Outlook Login Loop & Reset Search Cache: Full Guide

How to Fix Outlook Login Loop & Reset Search Cache: Full Guide+1 844-886-3118


Breaking the Outlook Login Loop

A login loop usually happens because of a "Token Mismatch" between your PC and the Microsoft 365 server.

1. The "Account Disconnect" Method

In 2026, Windows handles Office logins through the OS settings+1 844-886-3118 . If Outlook is looping, you need to "unstick" the account from Windows.

  • Close Outlook.

  • Go to Windows Settings > Accounts > Access work or school.

  • Find the account giving you trouble and click Disconnect+1 844-886-3118. (Don't worry, your emails are safe on the server).

  • Restart Outlook and sign in again. This forces a fresh, modern authentication token.

2. Clear the "Identity" Registry Key

If the loop persists, the identity cache in your registry might be corrupt.

  • Press Win + R, type regedit, and hit Enter.

  • Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity

  • Right-click the Identity folder and select Delete.

  • Restart Outlook. It will recreate a clean identity key.

Part 2: Resetting the Outlook Search Cache+1 844-886-3118

If Outlook says "No results found" or "Search performance is impacted," your index is likely broken. Here is how to perform a deep reset.

1. Rebuild the Search Index+1 844-886-3118

This is the "standard" fix that forces Windows to re-read every email.

  • In Outlook, go to File > Options > Search.

  • Click Indexing Options > Advanced.

  • Under the Index Settings tab, click Rebuild.

  • Note: This can take several hours depending on your mailbox size. Keep Outlook open.

2. Reset the OST File (The "Nuclear" Fix)+1 844-886-3118

If rebuilding the index doesn't work, the local data file (OST) itself is likely the culprit.+1 844-886-3118

  • Go to File > Account Settings > Account Settings.

  • Click the Data Files tab.

  • Select your account and click Open File Location.

  • Close Outlook.

  • Rename the .ost file to .ost.old.

  • Restart Outlook. It will create a brand new+1 844-886-3118  file and re-download your mail, automatically creating a perfect search index.



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How to Fix Outlook Login Loop & Reset Search Cache: Full Guide