Email Timeline: How to fix ‘Cannot open OST file’ Error in MS Outlook

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How to fix ‘Cannot open OST file’ Error in MS Outlook

In MS Outlook, OST file is among the most important components which provide the flexibility to work even in offline mode. To establish a perfect communication medium, Outlook OST file has to synchronize with MS Exchange Sever.

But sometimes, OST file gets corrupt which may result to loss of data. In fact, whenever any OST file suffer from any sort of corruption or error, each time the saved data in that particular OST file gets in-accessible . So, in order to overcome from such a situation you need to convert the OST file into corresponding PST file format.

To understand the issue better, let’s consider the following situation:

When you try to synchronize the OST file with the Exchange Server, suddenly you encounter MS Exchange Server is no longer exist. And if you attempt to access the OST file, you may get the following error message:

‘Cannot open OST file. You must access Exchange at least once to use the OST file.’

As the OST file has all the information stored in it like e-mail messages, contacts, calendars and meeting etc. The problem turns more complex whenever you try to access the OST file.

Reason of the error occurrence:

The root cause of getting such an error message is when Outlook automatically creates new OST files, which become unable to get recognized by the Exchange Server.


There is one manual method which you can perform the OST file to PST conversion in an ideal way. The full steps of manual method execution are shown below:
  1.  Open your MS Outlook and log in to your Exchange email server to view the contents of your OST file.
  2. In Outlook, click ‘File’ then click ‘Import and Export’.
  3. Navigate to ‘Export to a file’ and click ‘Next’.
  4. Click on ‘Personal Folder File (.PST)’ and click to ‘Next’.
  5. At the top of the list, click ‘Personal Folders’ then click ‘Include sub folders’.
  6. Now click the ‘Browse’ button and select the folder of your choice on the hard drive where you wish to store your PST file.
  7. Enter the file name and press ‘Enter’ after that.
  8. Select the duplicate items which you want to manage then at lastly click ‘Finish’.

However, this manual procedure can be very time consuming and may be unsuccessful in recovering the exact replica in the form of PST file. So, to get rid of such a situation you need a highly reliable and professional third party tool which can very easily and conveniently perform the conversion process from OST file to PST file.

Stellar OST to PST Converter is one such software that provides the cost effective solution to users in a safe and secure environment. This utility converts inaccessible OST file into usable PST file with multiple options to save like EML, MSG, RTF, HTML, and PDF. Moreover, this software is compatible with all versions including MS Exchange 2013.

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