How to Fix Outlook Not Syncing & Password Loops.
Showing "Disconnected", "Trying to connect...", or stuck in an endless authentication loop? Use this proven recovery protocol or book a certified remote tech.
Primary Causes of Outlook Sync Failures
Corrupted OST Cache File
High (Most Common)When the local offline cache file (*.ost) exceeds capacity or experiences an unexpected Windows restart, Outlook halts syncing incoming and outgoing emails.
Modern Authentication / Token Stalls
HighMicrosoft 365 or Gmail OAuth tokens stored in Windows Credential Manager expire or get corrupted, creating endless password prompt loops.
Faulty Third-Party Add-ins
MediumAntivirus, PDF converter, or CRM plugins crash Outlook's background MAPI sync threads, causing 'Trying to connect...' or 'Disconnected' states.
Incorrect SSL/TLS Port & Encryption Mismatch
MediumIMAP (993/SSL) vs POP3 (995/SSL) or SMTP (587/STARTTLS) authentication settings misconfigured after an ISP or email provider security upgrade.
Step-by-Step DIY Outlook Recovery Guide
Follow these steps carefully to restore email sync without risking mailbox data loss.
1. Launch Outlook in Safe Mode
Press Windows Key + R, type 'outlook.exe /safe' and press Enter. If email sends and receives properly in Safe Mode, navigate to File -> Options -> Add-ins -> COM Add-ins and disable third-party plugins.
2. Rebuild the Offline OST Data File
Close Outlook completely. Navigate to '%LOCALAPPDATA%\Microsoft\Outlook', find your email address OST file, and rename it to '*.ost.old'. When you restart Outlook, it will automatically pull a pristine mailbox copy from the server.
3. Clear Windows Credential Manager Entries
Open Windows Control Panel -> Credential Manager -> Windows Credentials. Delete all cached entries beginning with 'MicrosoftOffice' or 'adal_token', then reopen Outlook and complete fresh multi-factor authentication.
4. Run Microsoft Inbox Repair Tool (SCANPST.EXE)
For POP3 accounts with PST archives, locate SCANPST.EXE inside your Office directory (e.g. 'C:\Program Files\Microsoft Office\root\Office16') and run an integrity scan to fix internal directory blocks.
Frequently Asked Outlook Questions
Will rebuilding or renaming my OST file delete my emails?
No, as long as you are using IMAP or Microsoft 365 Exchange. An OST file is merely a local cache; all your emails, folders, and calendar items remain safely stored on the cloud server and will redownload cleanly.
Why does Outlook constantly prompt for my password even though it's correct?
This is usually caused by outdated Basic Authentication vs Modern OAuth2 protocols, or corrupted security tokens inside Windows Credential Manager. A remote technician can reset authentication registries and re-establish secure token handshakes in minutes.
Can a remote technician set up my email without seeing my confidential messages?
Yes. Our technicians only access network server settings, credential registries, and Office configuration panels. You sit at your desk and watch every cursor action in real-time on your screen.
Can't afford to miss important client emails?
Book an instant 15-minute remote triage session. Our engineer repairs sync profiles and restores sending/receiving immediately.
Three simple steps to a fixed machine.
Book Your Time Slot
Select your issue category and preferred session length (£19.99–£49.99). Pick an immediate or scheduled slot.
Connect in 1 Click
At your session time, open our secure connection client (or Windows Quick Assist) and share your 6-digit session PIN.
Problem Solved
Sit back while our UK-certified technician fixes the issue live on screen. Test everything before we disconnect.
Absolute transparency. Zero unattended access.
We understand granting remote access requires trust. Our entire support infrastructure is engineered around your control.
100% On-Screen Visibility
You watch every cursor movement and action in real-time. You can pause or terminate the remote connection with a single click at any second.
Zero Residual Software
We use temporary, one-time secure session tools (Windows Quick Assist, AnyDesk). Once the session ends, our access is permanently revoked.
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If our engineer is unable to diagnose or solve your stated computer issue, your upfront payment is refunded in full automatically.
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