If you use Outlook with Microsoft Exchange Server, Outlook stores all its messages, contacts, appointments, tasks, notes, and journal entries in a mailbox that is located on the server. The file on your hard disk that contains a copy of your account mailbox is an offline Outlook Data File (.ost). This copy provides quick access to data, including when you work offline, and is synchronized with the mail server.
If you have problems opening your .ost file or you get error messages when synchronizing your Offline Folder file (.ost) in Microsoft Office Outlook with your mailbox on a Microsoft Exchange Server, you’ll need to use a PST Walker tool to recover the contents of the OST.
Microsoft Outlook users who are leaving their current employer take the OST file with them, not realizing it can only be opened using the account that created it. If you no longer have access to the computer that was used to create the OST, PST Walker can open these files without a corresponding Exchange mailbox or profile on the server (orphaned files). The PST Walker can convert these files to more common Microsoft Outlook Message Format (*.msg files) that can be opened with Microsoft Outlook or other compatible mail client.
Follow the steps below to recover your emails:
1. Close the Microsoft Outlook and other applications that may use your mailbox
2. Click Open or select File->Open menu
3. Select the .ost file to open
4. Preview all your items including messages, contacts, appointments, tasks, notes, and journal entries
5. With "Export" under File menu you can convert .ost to .msg or .eml files
PST Walker is capable of converting password protected or encrypted ost file, and is very easy to use with Outlook look GUI. PST Walker supports all the latest versions of Windows and MS Outlook.