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Changing the extension of .OST files can be difficult. This is due to the fact that there is no built-in utility for converting to the .PST format from Microsoft. You can use third-party applications, such as Offline OST to PST Converter.

How to convert?

Extension .OST - This is the format in which mail messages are stored for Microsoft Outlook. A key feature of such files is the ability to use them without an internet connection.

When an Outlook account is changed or deleted, documents created under it in .OST format become unreadable. Files may also be damaged after a failed restore.

To avoid this problem, you can use third-party converters from the .OST to .PST format. Subsequently, files can be opened using Microsoft Outlook Express or standard Microsoft Outlook.

All software products can be divided into:

  • Paid - have great functionality, but you have to subscribe. They work without a network connection, they can recognize an encrypted or damaged file and restore it.
  • Free - their functionality is small, access to the Internet is required for work. There are restrictions on the size and number of files, sometimes decrypting or recovering .PST files takes longer.
Use only apps from trusted publishers. So you can avoid data loss and infecting your PC with viruses.

Offline OST to PST Converter
The program helps in changing the extension of .OST files and expands the functionality. To use the software features:

  1. Download from the official site and install: https://www.osttopst.online/ru/offline-ost-to-pst-converter. Installation may take some time.
  2. We launch the software product and select the convertible .OST file.

Go to Converter mode. We look at what is inside the file.

  • After clicking the “next” button, we click on the folder where the data will be saved. Select Save as PST file, then Save.
  • Data transfer does not require an Internet connection or authorization in Microsoft Exchange Server. It is possible to work with protected files of any size. There are no restrictions on the number of documents.

    Data conversion occurs selectively: you decide what information will be contained in the file. You can also choose the appropriate extension (for example, in addition to .PST, the formats .EML, .MSG and others are available).

    You can use the free trial version or purchase a paid one. Do not forget that data export will require Microsoft Outlook pre-installed software.

    Comments (2)

    Sergey, the instructions you indicated in paragraphs 2 through 4 are the deepest jungle. The export button in Outlook 2010 is much closer. To do this, in the File tab, go to the Open submenu, and then click on the Import item (yes, absolutely illogical, but it is). So you get to the Import / Export Wizard dialog box.

    Alex, thanks for your feedback.

    The option you proposed, although shorter by 1 action, can confuse users with its irrationality.

    How to save letters in Outlook

    You can save your mail from Outlook in two ways: save a specific letter and complete export of all letters and user information.

    When using any method, its attachments are saved along with the letter, but only attachments cannot be saved without writing an individual script.

    Saving specific emails

    Selective storage of mail is exactly the way that is usually understood as saving mail. It is designed to save certain letters, but nothing prohibits in this way save all your mail.

      Highlight the letter you need (left-click, as when opening) and go to the “File” tab.

    Highlight the letter you need and go to the “File” tab

    On the File tab, click Save As

    Select a folder and save the letter to the desired location

    How to select multiple letters

    If you select several letters and proceed to saving, all selected ones will be saved. There are two options to do this:

    • To select several specific letters, press each of them with the Ctrl key pressed,
    • All letters in the group can be selected using the keyboard shortcut Ctrl + A (first click on one of the letters so that the general selection command is applied specifically to the panel with letters).

    Export (save) all emails to a pst file

    This method involves creating a pst-file, which will include all the letters and their attachments.

      Go to the “File” tab, click on “Open and Export” and open “Import and Export”. In Outlook 2010, the path to this window will be different: “File” - “Options” - “Advanced” - “Export”.

    Go to the “File” tab, click on “Open and Export” and open “Import and Export”

    Select “Export to file” in the window that opens and click “Next”

    Select "Outlook Data File" and click "Next"

    Select your inbox and check "Include Subfolders"

    Select the path for the file to be created and click Finish

    Click OK if you do not want to enter a password each time to gain access to saved mail

    Where Outlook stores emails

    Outlook has its own pst file, in which all your mail is saved. This file is similar to the one described above. It can be located in different places.

    Possible paths to the pst file for Outlook 2016 and 2013:

    • drive: Users AppData Local Microsoft Outlook,
    • drive: Users Roaming Local Microsoft Outlook,
    • drive: Users Documents Outlook files,
    • drive: Users My Documents Outlook Files ,
    • drive: Documents and Settings Local Settings Application Data Microsoft Outlook.

    Possible paths to the pst file for Outlook 2010 and 2007:

    • drive: Users AppData Local Microsoft Outlook,
    • drive: Users Local Settings Application Data Microsoft Outlook.

    Import (restore) letters from a pst file

    This method assumes you have a pst file. How to create it is described above.

      Open the "Import and Export" window, as when exporting, and select "Import from another program or file."

    Select "Import from another program or file" in the window that opens

    Select "Outlook Data File" from the list and click "Next"

    Specify the path to the file using the "Browse ..." button and click "Next"

    Select the entire "Outlook Data File", select the account to which you want to export emails, and click "Finish"

    Recover deleted messages

    If you have cleaned the internal Outlook Recycle Bin, it will not be possible to restore the message.

      In the folder pane, open "Deleted Items". To see this panel in Outlook 2016 and 2013, click "All Folders" or the U-arrow in the left part of the window.

    Open "Deleted Items" in the folders panel

    Right-click on the letter you need, select "Move", and then the first proposed option

    Select "Another folder" and specify the path yourself

    How to archive letters

    It was previously mentioned about the main Outlook pst file. Over time, more letters and attachments accumulate in it, in accordance with which its size also grows. To free up some of the space on your hard drive, you can enable archiving.

    Archiving emails in Outlook is not divided into automatic and manual.

    Archiving involves turning one or more folders with letters (inside a pst file) into an archive. The folders themselves will not change for you in any way, but everything that is there now and will fall into the future will be compressed.

      Go to the “File” tab. In the "Details" section, click on "Cleaners" and select "Archive ...".

    In the "Details" section, click on "Cleaners" and select "Archive ..."

    Check “Archive all ...” or select folders for compression, then click OK

    Outlook marks the message as read

    1. If the letter is marked as read regardless of whether you read it or not, go to the “File” tab and open “Options”.

    Go to the “File” tab and open “Options”

    Go to the "Mail" section and open the "Reading pane ..."

    Uncheck the first item and click OK

    Outlook does not mark read emails

    If the letters you read are not marked - as in the case of the previous problem - you need to go into the settings of the reading area. Mark the checkmark “Mark as read when another message is selected” and click OK.

    Tick ​​the second item and click OK.

    Outlook does not load old letters

    1. If old messages do not appear, go to the “File” tab and in the “Details” section open “Account Settings ...”.

    Go to the “File” tab and in the “Information” section open “Account Settings ...”

    Double-click on your inbox

    Drag the slider all the way to the right and click next.

    Creating backups - or saving information to an additional medium - is a good thing. Mail is rarely lost, but it’s better to have insurance, especially if the messages contain important data. Try to periodically save the file with letters, even if you do not plan any changes.