How to open .OST file?

5 pts.
.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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seems your
file is corrupted. Hence if you want to open this corrupted ost file
and you have availability of Exchange then don’t worry.
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.
go through the following procedure;

Locate ost file on the disk and rename it after right clicking on it

change extension from .ost to old.ost and hit enter

Now excess Exchange Server and open Outlook

It will reconfigure the data file
the new ost file will not be corrupted, one can access it

Apart from this if you want to open this ost file in PST file format,
you can choose Import/Export option of Microsoft Outlook.

try to free Convert OST to PST tool

Discuss This Question: 5  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.

    61,930 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.

    12,350 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
    10,050 pointsBadges:

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