Outlook .OST File Cannot be Accessed because It has been Configured for Use with a Different Mailbox

Error Code: "Filename.ost" cannot be accessed because it has been configured for use with a different mailbox.

Applies to: Microsoft Outlook 2003, Microsoft Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013 and Microsoft Outlook 2016.


When you start Microsoft Outlook, try to import moved OST file or attempt to access existing OST file in a newly created user profile, the error “OST cannot be accessed because it has been configured for use with a different mailbox” appears on-screen and prevents you from accessing Outlook.


This error can occur if,


Step 1: Login with old username (it should be a cached login), which you had used while creating the OST file for the first time.

Open Outlook and export the OST file data into PST format.

Next, log in as system Administrator and take ownership of the OST file; then import it.

Step 2: Press Windows + R keys together.

Type Outlook /resetnavpane (give space between Outlook and /) and hit Enter key.

Now, try to access your OST file in a new Outlook profile.

Step 3: Find Outlook (.exe) in,

For Windows 7 32bit system: C:\Program Files\Microsoft Office\OfficeX

For Windows 7 64bit system: C:\Program Files(x86)\Microsoft Office\OfficeX

(X varies depending on the version of your Outlook application)

Right click on Outlook (.exe) and select Properties.

Under Compatibility, uncheck all the boxes.

Step 4: Close Outlook and go to Start menu.

In Run window, type C:\Program Files\Common Files\System\Mapi\LocaleID\scanost.exe

(LocaleID is the locale identifier (LCID) for your Microsoft Office installation)

Click OK and opt for Scan all folders.

Enable Repair errors and Begin Scan.

What If Above Fixes Don’t Work?

In case, above common fixes failed to work and you don’t want to lose your OST file data, then converting it to PST format would be the last (best) solution. And, when it comes to OST to PST conversion, it is recommended to use Yodot OST to PST Converter to complete the conversion process in the easiest and most efficient way ever possible.

Why Yodot OST to PST Converter?

This ideal PST converter software performs risk-free conversion of all attributes stored within your OST file to PST format. The tool even supports encrypted (password-protected) OST file conversion. Not just conversion, even you can view the converted PST file using the software. Thus, it lets you preview emails, calendar entries, tasks, etc. items of the converted PST file.

This effective program comes handy not only when you are facing trouble in accessing Outlook due to OST cannot be accessed because it has been configured for use with a different mailbox error, but also if by any chance you are experiencing OST file corruption or damage issues thus your default Outlook profile.ost cannot be accessed. And, an excellent technical assistance is also available round the clock to help you at every instance.

In addition, using demo version of this perfect OST to PST conversion product, you can convert your affected OST file and if you are satisfied with the outcome, proceed to purchase it.

Steps to Convert OST- Configured for Different Mailbox into PST:

Step 1: Install Yodot OST to PST Converter software on your Computer.

Step 2: Run the installed OST to PST converter and go with one option among,

Step 3: Specify the destination path to store the converted OST file.

Step 4: Click on Convert button to start OST to PST conversion process.

After the conversion, a confirmation message will flash on the screen.

Security Note:

  • Use internet security shield to shun entry of harmful emails that corrupt your mailbox
  • Never use unknown programs for OST to PST conversion

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