How to open an OST file in Outlook 2019, 2016, 2013 and 2010? (2023)

What do you need to know about offline storage table file?

AOST-Datei (Offline Storage Table).is a Microsoft Outlook data file that lets you work with your email, calendar, and other data items when you're not connected to the Internet. The OST file is created when setting up an Exchange or Office 365 account in Outlook and encrypted with theMAPIEntryID GUID key. So when you access your mailbox in Outlook, the application identifies and associates your email account on the server with this key and synchronizes emails and other data. If the Exchange server is unavailable or crashes due to hardware failure, theOST file is orphaned, making it difficult to access your email data.

Before we proceed, it is important to note that the OST file is tied to the Exchange Server mailbox profile. This means that you cannot open an OST file with another Exchange Server mailbox profile or account. When you create a new Exchange profile,Outlook creates a new OST fileand all changes of the old file that have not been synced to the server will be lost completely.

In this article we discussHow to open an OST filein Outlook and how EdbMails can help you open, preview and previewConvert an OST file to a PSTif it becomes orphaned or damaged.


Your mailbox has been temporarily moved to the Exchange serverRecover metadata and attachmentsYour Outlook data file cannot be configuredRepair corrupted OST filesRecover all Exchange and Outlook OST filesImport the OST file into Outlook

How to open an OST file in Outlook 2019, 2016, 2013 and 2010? (1)

How do I find an OST file on your computer?

Here are the default locations of OST files in different versions of Outlook:

  1. For Outlook 2019 and 2016

    The default location of OST file in Outlook 2019 and 2016 is:


  2. For Outlook 2013

    The default location of OST file in Outlook 2013 is:


  3. For Outlook 2010

    The default location of OST file in Outlook 2010 is:


  4. For Outlook 2007

    The default location of OST file in Outlook 2007 is:

    C:\Benutzer\Local Settings\Application Data\Microsoft\Outlook

Note that the actual location of the OST file may vary depending on your system configuration and Outlook settings. If you cannot find it in the default location, you can find the OST file in Outlook as follows:

  • Step 1: Go to the File tab in Outlook
  • Step 2: Navigate to Account Settings
    • Click'Account Settings', then select'Account Settings'again from the drop down menu.
  • Step 3: Click Data Files and open the OST file location
    • Im'Account Settings'window, go to'File'Tab.
    • Select the OST file you want to open and click the‘Open file location’Button that opens the folder where the selected OST file is located.

How to open an OST file in Outlook 2019, 2016, 2013 and 2010?

To open an OST file in any version of Outlook, convert the OST file to a PST file and import the PST file into Outlook to view all your email data.

Method 1: Convert OST to PST and open the PST in Outlook

Note:This method is only applicable if the OST file is in good condition. If the OST file isbadly damaged, encrypted or made inaccessible due to Outlook crash, Outlook cannot convert OST file to PST and you need to useEdbMails to repair Outlook data fileand extract all your email data.

  • Step 1: Start Outlook and go to Import-Export Wizard
    • Open Outlook and click'File'Tab in the top menu bar
    • Click on"Open & Export"and select'Import Export'from the options

  • Step 2: Choose the option to export to a PST file
    • Select in the import and export wizard"Export to a file"option and click'Next'
    • Choose„Outlook-Datendatei (.pst)“option from the list of file types and click'Next'

  • Step 3 Select the folders and subfolders to export

    Select the options according to your needs, e.g. B. whether to include subfolders or not.

    Click on'Next'keep going

  • Step 4: Choose export location and convert OST file to PST
    • Choose the location where you want to save the exported PST file
    • Select the options according to your needs, e.g. B. whether to replace duplicates or not
    • Click on'End'to complete the export process
    • The OST file will be converted into a PST file and saved in the location you specified.

  • Step 5: Open the exported PST file in Outlook
    • After the conversion is complete, you can import and open the PST file in Outlook.
    • Open Outlook and go to the Import/Export Wizard again
    • Choose"Import from another program or file"and follow the steps to import all your email data to Outlook.
    • That's it! You have opened the contents of the OST file in Outlook.

Method 2: Use EdbMails OST to PST converter to open OST file

Note that if you right-click the OST file and try to open it directly in Outlook, you will get an error message: "The program you have selected cannot be associated with this file type. Please choose another program.

Because of this, you need to either convert OST file to PST or use EdbMails to open OST file without Outlook. In addition, this method is also applicable if you want to open an Outlook OST file on another computer without the original profile that you configured your account with. EdbMails supports OST files from all Outlook versions like 2021, 2019, 2016, 2013, 2010, 2007 and 2003.

Here are the steps to open OST file without Outlook:

  • Step 1 Download EdbMails OST to PST Converter
    • Download and install the application on your computer
    • Click'Start your free trial'to use EdbMails directly
    • Select the option"OST to PST, OST to Office 365 and OST to Exchange"from the home screen
    • Click on'Let's go!'

  • Step 2: Select the OST file to be repaired and view its contents
    • Browse and select the OST file on your computer that you want to repair and convert to PST
    • Click'Keep going'

  • Step 3: Preview emails, contacts and other email items
    • EdbMails will automatically scan the OST file and display the content
    • You can preview the content of the OST file before conversion, including the email items and folders.
    • Select desired conversion settings like destination location, output file split and other advanced filtering options.

    EdbMails does not require Outlook to open an OST file. However, to convert OST to PST, Outlook must be installed on your computer.

  • Step 4: Start the OST to PST conversion
    • Click"Export to Outlook PST"to start the OST to PST conversion.
    • Wait for the process to complete and check the exported items against the log report.
  • Step 5: Import the converted PST file into Outlook
    • After the conversion is complete, navigate to the destination location you selected in Step 3.
    • The converted PST file is here and you can now open it in Outlook
    • That's it! You have successfully opened, previewed and converted the OST file to PST with EdbMails.

EdbMails OST to PST Convertercan come in handy in scenarios where the manual methods of opening an OST file in Outlook might not work. Here are some specific scenarios where the converter application can be a valuable tool:

  1. OST File Corruption:If the OST file is corrupted due to various reasons like hardware failure, software crash or virus attack, then it might not open in Outlook. In such cases, EdbMails OST to PST Converter can be used to recover the data from the corrupted OST file and convert it to PST format.
  2. OST File Encryption:If the OST file is encrypted with a password, it cannot be opened in Outlook unless the password is entered. EdbMails can be used to recover the data from the encrypted OST file and convert it to PST format without requiring any password.
  3. Unsupported OST file version:If the OST file was created in an older version of Outlook that is not supported by the current version of Outlook, it may not open in Outlook. In such cases, EdbMails OST to PST Converter can be used to convert the OST file to a PST format supported by the current version of Outlook.
  4. Convert Large OST File Size:If the OST file is too large, it may take a long time to open in Outlook or may get corrupted. EdbMail OST to PST Converter can be used to convert OST file to PST file by splitting the output file into smaller sizes during conversion.


The only way to open an OST file directly from Outlook is to convert it to PST format and import your email items into Outlook. If the OST file is orphaned or corrupted, Outlook doesn't even try to convert it. You can use EdbMails OST to PST converter to open and view the contents of the OST. EdbMails allows youImport Outlook Data File (OST) into Office 365, Exchange and can also convert OST files to HTML, MHT and EML formats while maintaining data integrity and formatting.

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