An OST (Outlook offline folder) is the local storage file of MS Outlook that makes it possible for the user to work offline when configured to Exchange Server. Once the application sets up a secure connection with Exchange Server, the OST file synchronizes the changes that it finds with the corresponding mailbox. The OST is unusable and inaccessible without synchronization being properly done with mailbox, after which the file converts into application-readable PST.

At times, the instances like, deletion of user mailbox, changes in Exchange profile, and database crash result into an orphaned OST. If the OST fails to synchronize with the Exchange Server or gets corrupt, all the mails, journals, notes, contacts etc. become inaccessible. In such cases, you need to convert the unusable OST to usable PST.

Stellar Phoenix Mailbox Exchange Desktop is a reliable and powerful OST to PST solution that can convert an Outlook OST to a directly-importable PST. The OST PST Converter uses high-end scanning algorithms that safely extract the inaccessible file objects into a form that can be directly used and accessed.

To convert OST to PST file format, you need to follow these steps:

Selecting OST file to repair:
The 'Select Outlook File' option allows you to select the affected PST directly from a user-known location or search it in any drive or folder:

Searching for OST Files in hard disk:
Click 'Find Outlook File' to search for the OST file in the hard disk.

Searched OST files:
The searched OST files will be displayed as shown in the following figure. Click the desired OST file and click OK to select it.

Selected OST File to recover:
Click the 'Start' button to start the repair process for the selected OST file.

Recovered OST components:
The recovered OST components will be displayed as shown in the following figure. The interface is very similar to the 3-paned structure of Outlook.

Viewing Log Report for OST Recovery:
You can view the log report for the recovered OST objects by clicking View | View Log Report.

Saving Recovered OST file as PST file:
The recovered OST components can be saved in a PST file, as shown in the following figure

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