How to Convert Old OST File to PST File?

“Hello!! Previously I was using Outlook 2007 version and recently upgraded to Outlook 2010 version. I am trying to convert my old OST file to PST to use it in latest configuration but I don’t know how to do this task. I am hesitating to apply unknown procedure because it may cause synchronization issues. If anyone knows exact method of converting old OST to PST file, then please help me with your reply. Thanks in Advance”

OST file act as mirror image of Outlook mailbox on Exchange server. To fetch data from an old OST file in Outlook, you need to convert it to PST file. Conversion of OST file gets necessary because, OST file cannot be opened or imported as it is done with PST file. OST is dedicated to only on system and one Outlook application. While trying to move mailbox and configure Outlook to online mode, OST file should be converted compulsorily.

Also, need of old OST file conversion to PST file will rise if OST is corrupt due to unfair conditions like -

  • Incorrect Outlook configuration
  • File exceeding limited size
  • Malware attack
  • Hard disk logical errors like file system damage, bad sector, etc.
  • Missing of Outlook associate files such as .dll, .srs, etc
  • Interruption while synchronizing OST file with Exchange Server

To overcome above mentioned issues, it is recommended using third party application to convert old OST to healthy PST file.

Software to convert old OST to PST file:

If you want to convert OST to PST file within a short period of time by simply applying 2 to 3 steps, then use Yodot OST to PST Converter program. This tool works on read only mode, so it will extracts contents of Outlook old OST file and creates a new PST file without altering original content. Along with healthy OST file, it can convert damaged OST file to PST file. Even, it has the capability to covert password protected OST file. This utility can easily retrieve vital emails and other info if deleted during conversion process. It restores all items like attachments, sent items, notes, calendars, rules, alerts, etc. in same folder structure in PST file. Outlook users using Outlook 2002, 2003, 2007, 2010, 2013 and 2016 Office versions can utilize this tool to convert OST files. Also, it can fix error OST file is not an offline folder file, OST error cannot open your default email folders and exchange object could not be found error. This utility is compatible to run on all versions of Windows operating system such as Windows 8, Windows 7, Windows XP, Windows Vista, Windows Server 2003 and 2008.

Procedure to export old OST to PST file:

  • Install and run Yodot OST to PST Converter software on a Windows system
  • You will get two options from main screen such as “Open OST file” and “Find OST file”. Click on Open OST File if you know exact location of OST file or select “Find OST File” if you don't know the location
  • Next, browse for destination location where converted PST file has to be stored
  • Then, click on “Convert” button to start exporting process
  • Once process is completed, it will display confirmation message by stating process is completed successfully


  • Apply proper procedure to synchronize OST file with Exchange Server
  • Configure Outlook properly while creating Outlook profile