Your Outlook Data File (OST) Cannot Be Configured’ in Outlook 2013 – What to do?

Nikita Garg
Nikita Garg

Updated On - October 19, 2022

MS Outlook 2013 sometimes fail to start with the display of any of these errors:

  • Your Outlook data file cannot be configured. <path of .ost file>

Outlook data file cannot be configured. path of .ost file

  • Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.

Cannot start Microsoft Outlookh

Let us know a little about the error and the methods to remove this error.

Recommended Solution
In case of server crashes, it is recommended to convert the OST files to PST files using the Recoveryfix for OST to PST converter tool. It is capable of recovering even inaccessible data to the desired location.

The reason for Outlook cannot be configured error

this issue occurs due to the following type of registry configuration on the computer:



DWORD: UseLegacyCacheSize

Value data: 1

Manual method to resolve ‘Your Outlook data file cannot be configured.’

This manual method involves modifying registry value. As incorrect registry modifications can cause issues, it is recommended to backup the registry before starting.

  1. Exit Outlook.
  2. Open the Registry Editor box by selecting Windows + R on the keyboard. Type exe and then press OK.

    Registry Editor box by selecting Windows + R on the keyboard

  3. Once the Registry Editor box opens, locate:


  1. Once located, right-click on the value “UseLegacyCacheSize,” select Delete.
  2. Click on Yesand exit the registry editor.

This will solve the ‘Your Outlook Data File (OST) Cannot Be Configured’issue in MS Outlook 2013.

Mailbox inaccessibility due to Exchange issues

Sometimes user mailboxes can be inaccessible due to Exchange issues like crashes, mailbox deletion, etc. In such situations, users can convert their OST files to PST files so as to access the mailboxes instantly. For this, they need to rely on a third-party OST to PST Converter.

Download Now

Recoveryfix for OST to PST is one such expert tool that works well with accessible as well as inaccessible OST files for converting them to PST file format.


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