Permission & Access Issues

How to Unlock and Copy a Locked Outlook PST File

Tauseeq Magsi Oct 9, 2026 869 views

Question details

The user is unable to copy their main Outlook.pst file to a new computer because the system indicates the file is open or locked, even though all Office applications are closed.

How to Unlock and Copy a Locked Outlook PST File

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Migrating or backing up Outlook email data to a new computer or external drive.
Observed behavior: The system prevents the PST file from being copied, displaying an error that the file is in use or locked, while other secondary PST files can be copied without issues.

Before you start

Ensure you have administrator privileges on your computer, as changing file permissions or terminating background processes will require elevated access.

Solution 1Recommended

Force Close Outlook Processes in Task Manager

Ghost processes can keep the PST file locked even after you visually close the Outlook application.

Often, Outlook or related background services (like indexing or synchronization tools) fail to shut down completely. Using Task Manager ensures all ties to the PST file are severed.

Open Task Manager

Right-click on the Windows Taskbar at the bottom of your screen and select 'Task Manager' from the context menu.

Locate Outlook Processes

In the 'Processes' or 'Details' tab, scroll through the list to find 'Outlook.exe' or any Microsoft Office related background tasks.

End the Task

Select the Outlook process and click the 'End task' button in the bottom right corner.

Attempt to Copy

Navigate back to your PST file's folder and try copying it again to your desired destination.

Force Close Outlook Processes in Task Manager

Restart as an Alternative: If you are not comfortable using Task Manager, simply restarting your computer and attempting to copy the file before opening any applications can achieve the same result.

Solution 2

Check PST File Permissions and Ownership

Incorrect Windows file permissions can restrict you from copying or modifying the file.

Solution 3

Copy the PST File in Safe Mode

Booting Windows in Safe Mode prevents third-party apps and non-essential services from locking the file.

Free Microsoft Office alternative

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Frequently Asked Questions

Why does my PST file say it is open in another program when Outlook is closed?

Hidden background processes, Windows search indexing services, or third-party antivirus/backup tools might be actively scanning or accessing the PST file, causing the operating system to treat it as locked.

Can I safely copy a PST file while Outlook is running?

No. You should never copy, move, or modify a PST file while Outlook is open. Doing so can cause severe data corruption or result in incomplete file transfers.

Where is the default location of the Outlook PST file?

By default, modern versions of Outlook store PST files in 'C:\Users\[YourUsername]\Documents\Outlook Files'. Older versions may store them in 'C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook'.

Document & File Issues