How to open .OST file?

.OST files
Microsoft Outlook 2010
I was looking through the working calendar, e-mail program Outlook 2010 suddenly reported error and closed. After restarting, it couldn't open the .OST file. How to open .OST file?

Answer Wiki

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It seems your OST file is corrupted. Hence if you want to open this corrupted ost file and you have availability of Exchange then don’t worry. Since OST is the replica of the Exchange Server mailboxes data it means if OST gets corrupted it can be recreated and assembled downloading all the data again in it. Simply go through the following procedure;

  1. Locate ost file on the disk and rename it after right clicking on it
  2. Change extension from .ost to old.ost and hit enter
  3. Now excess Exchange Server and open Outlook
  4. It will reconfigure the data file and the new ost file will not be corrupted, one can access it
  5. Apart from this if you want to open this ost file in PST file format, you can choose Import/ Export Option of Microsoft Outlook.

You need to try best OST to PST Converter Software and you will be able to open ost file with this program.

OST to PST converter is a crucial and successful application to learn how to convert OST file data into PST outlook. This OST to PST Converter program smartly scan damage or inaccessible Outlook OST file data after that you can also save OST file into working MS outlook (PST file).

You can Convert 20 emails per folder and able to convert multiple ost files to pst format within few moments taking less time. Entire OST files and folders easily convert to PST format with OST to PST Converter Software

Discuss This Question: 8  Replies

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  • Subhendu Sen
    Virus checking is also an important part to confirm if your PC is not affected by virus. Or you can re-create an offline outlook data file (.ost).

    They are simply copies of exchange information. It is not necessary to back up this file. It can create a new copy at any time.

    134,650 pointsBadges:
  • bobluis
    OST by default store on local computer, you can still find and open it on your local system.
    1,450 pointsBadges:
  • Harisheldon

    An.ost is the data file, created when you first log onto Outlook. It is not a file to store information on.

    If you ever have any issues logging into Outlook, you can delete the .ost file, and then log back onto Outlook and it will be recreated.

    12,900 pointsBadges:
  • alina91
    Use .OST viewer tool available online or convert it to .PST extension with help of online tools available.
    545 pointsBadges:
  • Genderhayes
    Try downloading off of your Exchange server follow above steps answer "Wiki" cause Outlook don't directly export from a OST file it can from a PST file
    10,720 pointsBadges:
  • 8586virat
    Hey, don't go for this paid tools. 
    Just open google and search "SysInfo OST File Viewer".
    This is a free viewer tool which helps you in viewing your files even when your ost files are corrupted.

    Hope this answer helps
    520 pointsBadges:
  • ashishkr2012
    Here is another solution available at that helps to Import/ Export Option of Microsoft Outlook.
    125 pointsBadges:
  • ToddN2000
    IF you have problems with an OST or even a PST file try repairing it first. For some good instructions check out WIndows Central 
    129,715 pointsBadges:

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