Email Recovery

Fix Missing Outlook PST Files After Windows Reinstall

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to recover and reconnect missing Outlook PST files and media libraries that became disconnected after reinstalling Windows or repairing Microsoft 365.

Product: Microsoft 365 / Microsoft Outlook
Device & OS: Windows
Scenario: Reinstalling the Windows operating system or performing a system repair on Microsoft 365.
Observed behavior: Outlook PST data files and local media libraries are missing or disconnected from the applications. OneDrive fails to sync or restore the missing PST data.

Before you start

Verify that you are logged into Windows with an administrator account and ensure your File Explorer is set to show hidden files and folders, as PST files are sometimes stored in hidden AppData directories.

Solution 1Recommended

Search Local Drives and Manually Reconnect PST Files

Use File Explorer to locate the disconnected PST files and manually add them back into Microsoft Outlook.

Since OneDrive does not natively sync Outlook PST files, they must be manually located on your local hard drive or from a physical backup.

By default, Windows stores these files in the Documents folder or the local AppData directory.

Search for PST Files

Open File Explorer (Windows Key + E), click on 'This PC', and type '*.pst' in the top-right search bar to scan your entire drive for Outlook data files.

Note the File Location

Once the search finishes, right-click your desired PST file and select 'Open file location'. Make a note of this folder path.

Open Account Settings in Outlook

Launch Microsoft Outlook. Click the 'File' tab in the top-left corner, click on 'Account Settings', and then select 'Account Settings' from the drop-down menu.

Add the Data File

Navigate to the 'Data Files' tab and click the 'Add...' button. Browse to the folder path you noted earlier, select your PST file, and click 'OK' to reconnect it.

Common PST Locations: Check 'C:\Users\[YourUsername]\Documents\Outlook Files' and 'C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook' first, as these are the default save locations.

Solution 2

Run System File Checker and Repair Microsoft 365

Use Windows command-line tools to fix corrupted system components and perform an online repair of the Microsoft 365 suite.

Free Microsoft Office alternative

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Frequently Asked Questions

Why didn't OneDrive backup my Outlook PST files?

OneDrive intentionally excludes active Outlook PST files from synchronization. Because PST files are actively modified databases, syncing them while Outlook is open causes severe conflicts, data corruption, and high bandwidth consumption.

Can the SFC and DISM commands recover my deleted PST files?

No. SFC (System File Checker) and DISM are designed to scan and repair missing or corrupted Windows system files. They cannot recover personal data files like PSTs. You must rely on manual hard drive searches, previous local backups, or specialized data recovery software.

Where are Outlook PST files normally stored in Windows?

By default in newer versions of Outlook, PST files are saved to 'C:\Users\[YourUsername]\Documents\Outlook Files'. In older versions, or depending on your configuration, they may be hidden in 'C:\Users\[YourUsername]\AppData\Local\Microsoft\Outlook'.

Migration & Recovery