Locating Old Outlook .OST Files

Purpose

Find where Outlook Offline Data Files (.OST) are stored on your computer for troubleshooting, migration, or cleanup.

What You’ll Need

• A Windows PC with Microsoft Outlook installed

• File Explorer access

• Outlook profile configured on your computer

Step-by-Step Guide

Default OST File Location (Windows 10/11)

1. Open File Explorer.

2. Navigate to:

   C:\Users\<YourUsername>\AppData\Local\Microsoft\Outlook\


3. Look for files with the extension .ost.

   • Each file corresponds to an Outlook profile/account.

Alternate Way via Outlook Settings

1. Open Outlook.

2. Go to File > Account Settings > Account Settings.

3. Select your email account → click Data Files tab.

4. Note the file path of your .ost file.

5. Use File Explorer to navigate to that folder.

Tips for Best Practice

• Do not delete .OST files directly unless instructed by IT; Outlook can recreate them, but unsynced changes may be lost.

• If Outlook performance issues occur, consider recreating the profile instead of manually deleting OST files.

• Backup important Outlook data using .PST export (File > Open & Export > Import/Export).

• Use the OST file location for troubleshooting sync issues or freeing up disk space.

Need Help?

 

Contact All in IT Solutions today for expert assistance.

• Phone: 1300 255 464
• Visit: Support Page