Fix OST File


Convert OST file to PST when Outlook fails to synchronize offline data with Exchange Server

As email communication system is a vital component for successful business, organizations of any size solely depend on it. MS Outlook is the most popular email client used by most of the enterprises worldwide. Both Exchange Server and Outlook provides flawless emailing service to the user. Apart from this, Outlook also facilitates the user to perform necessary operations while he/ she is offline or disconnected with server. It becomes possible with a special file that acts as the replica of the data saved in user mailbox over Exchange Server. Offline Storage Table or commonly known as OST is responsible for making the user work offline without the support of Exchange Server or internet connection. This file helps in synchronizing MS Outlook email to Exchange Server.


Sometimes, OST file becomes corrupt and errors occur during synchronization of OST with MS Exchange Server. Once OST gets corrupted, it becomes difficult to work again with the mailbox data and access the emails. At such situation, system generates error message stating the particular cause of synchronization errors. As synchronization process remains incomplete, OST file becomes unusable. In addition user receives an error message like this:

  • Synchronizer Version version_number
  • Synchronizing Mailbox 'user_name'
  • Synchronizing Hierarchy
  • Terminated in error
  • [80040119-100A0103-0-610]
To overcome the synchronization issue and reuse the mailbox data stored in OST file, one can follow the following steps:
  • Uninstall/disable the anti-virus software running on the computer.
  • Check all the network devices and make sure they are working properly.
  • Perform manual OST synchronization using below steps:
  • Click 'Tool' option
  • Select 'Synchronize'
  • Lastly, choose 'The Folder or All Folders'
  • Ensure that the profile settings are correct and MS Exchange service and mailbox are the default delivery destinations.

The above method can fix the synchronization issue and make the offline data usable. But there are some cases evident when manual method doesn’t work properly or fails to resolve the synchronization issue to make the offline data usable. One easy and effective method to recover OST data is to convert the file to Outlook PST file so that it becomes accessible with Outlook. Once OST mailbox data is exported to PST, they become completely accessible with MS Outlook and emailing can be resumed normally. You can carry out OST to PST conversion process with the help of three simple steps:

  • Locate your inaccessible OST file
  • Extract data from it
  • Save it in new PST file which can be accessed with MS Outlook

Commercial converter tools give the best result while converting OST file to PST. One such the tool OST to PST which follows simple basic steps to execute the mailbox conversion process. It lets user browse the OST file, extracts mailbox data from it and restores the data to new PST file. The PST file so created becomes usable with MS Outlook. The best feature with this tool is it is completely reliable and does not incur any change to the existing data of the OST file during conversion.