An OST file aka offline storage table is found in Outlook mailbox of the user machine, which is a local copy of folders (like emails messages, contacts, calendars & other items) delivered to and stored on the mail server. This makes it possible for the users to work even in offline mode, but only when the Cached Exchange mode is enabled. The relevant changes during the offline mode are then synchronized with the respective server, whenever the connectivity is available.

However, these offline folder files are delicate in nature and may lead to corruption when go through any unfavorable environment or circumstance. Some of the reasons are discussed below:

  • Abnormal Termination of Outlook: The chances of corruption increases in OST files when Outlook is not terminated properly. There could be any reason for abnormal termination of Outlook, like power failure, accidental shutdown, etc. Whenever you try to open or access OST files or Outlook tries to synchronize the changes with Exchange then OST files may get corrupt.
  • Data Storage Device Failure: The existence of bad sectors in your hard disk can also be the responsible reason for corruption.
  • Virus Attacks: The presence of viruses in your system may infect the OST files while making them inaccessible.
  • Synchronization Trouble: OST files may get corrupt, when there is any indifference between the synchronization of Outlook and Exchange Server. Poor network connectivity or conflict of items etc. may be accountable for the synchronization troubles.

Although, there are myriads of other reasons like deficiencies in Outlook program, incorrect file system recovery network connection failure, accidental deletion of outlook emails, Exchange Server crash, etc. may lead to corruption in Outlook OST files.

The user is unable to access the data of OST files when these files get corrupt. Usually, an error message is displayed whenever the file gets corrupt. Below given are some of the common error messages that you may frequently encounter working with OST files:

  • "Unable to expand the folder. The set of folders could not be opened. Errors could have been detected in the file xxxx.ost. Quit all mail-enabled applications, and then use the Inbox Repair Tool."
  • "Cannot open particular Outlook items when offline"
  • "Cannot open your default email folders. The file xxxx.ost is not an offline folder file."
  • "Various errors when synchronizing Exchange Server mailbox with your OST file."
  • Encounter a large numbers of conflict items.
Secure Your Data Files Using OST to PST Converter

Kernel for OST to PST is a reliable OST file conversion tool that proficiently repairs damaged OST files and export them to Outlook PST files safely. The software is well-proven to repair corrupt OST files and restore the complete information successfully, which cannot be expected using Inbox repair utility (scanpst.exe). The tool uses advanced features to let you effortlessly export OST files directly to Office 365 mailbox, to various email servers and web-based email apps.

Exclusive Features of Kernel for OST to PST Tool
  • Inbuilt Search Facility: The software integrates advanced search feature to let you quickly find out the corrupt or healthy OST file from the selected volume of the drive. This feature is really helpful to perform quick searching of OST file, especially when the user is unfamiliar with the exact whereabouts of the file.
  • Batch File Conversion: The tool can quickly convert unlimited number of OST files at once using option to convert multiple files. Exchange OST to PST Tool is even integrated with ′load snapshot only’ feature to record the conversion process and load them later. Manage the retrieved OST email items from preview panels and select desired emails to facilitate the saving process.
  • Multiple Saving Options: Besides the option to save OST files to PST file format, the tool supports various other formats to save OST files to DBX, MSG, EML, MBOX, TXT, RTF, HTML, MHTML, & PDF.
  • Preview Facility: Upon recovering the OST files, the software displays them within the tool, where users can view and open the items for detailed previewing.
  • Advanced Migration Support: This standalone tool is competent to migrate OST files data to various platforms like Office 365, Lotus Domino, Novell GroupWise, Exchange Server, Yahoo Mail, Gmail, Outlook.com and even more, without requiring the help of any additional resources.
  • Impeccable Conversion: The complete conversion process is performed with utmost care of data integrity. Exchange OST to PST Tool preserves exact properties of data items of the file including To, CC, From, BCC, Subject, Send Date, and Receive Date etc. upon conversion.
  • Friendly Interface: The software incorporates intuitive GUI design, which requires no exclusive skills to operate the tool. It provides self-explanatory step-by-step procedure to convert OST files to the desired location.
  • Seamless Compatibility Support: Kernel for OST to PST is fully compatible with all versions of Microsoft Outlook including 2016, MS Exchange Server (2016) and Windows OS (Windows 10).
Free Trial Version

Kernel for OST to PST software ensures absolute transparency to the end-user, for which it facilitates free download and use of demo version. This free version of Exchange OST to PST Tool has similar functionality as of licensed version, but with certain limitations. Although, it has the potential to repair and preview OST files data, but restricts to convert only first 25/folder to PST files.