Summary: When errors are detected in the OST file, you may find a problem in opening the Outlook. This indicates a problem with the OST file and requires an immediate fix. You can follow the various methods discussed in this post to fix the OST file errors. However, if the errors are not fixed, you can extract the mailbox data from the OST to Outlook importable PST file by using Stellar Converter for OST software.
OST or Offline Storage Table is a replica of the mailbox data stored on the Exchange server. OST is an offline Outlook data file, which is created on the local machine when you configure or sign in using your Exchange, Office 365, or IMAP account in MS Outlook.
It lets users access, read, and draft messages even when the system is offline. All changes done offline are synchronized with the Exchange server when the system is connected to the internet.
Generally, Outlook data files, such as OST, are quite reliable. However, it may stop working or get damaged due to various reasons such as,
As a result, you may see the following OST error while accessing the MS Outlook,
Errors have been detected in the file C:\Users\User Name\AppData\ Local\ Microsoft\ Outlook\ FileName.ost. Quit Outlook and all mail-enabled applications, and then use the Inbox repair tool (Scanpst.exe) to diagnose and repair errors in the file. For more information about the Inbox repair tool, see Help.
Since the error is displayed when you try to open Outlook, you can follow a few quick steps to repair the OST file and fix the errors detected in the OST file. These are as follows,
The best way to fix the OST errors is to replace the damaged OST with a backed-up copy. However, if the backup was not taken very recently, you won’t be able to get back the recent data. This may fix the error but can lead to data loss.
If an incompatible or damaged add-in is the reason for the error, you may try to start MS Outlook in safe mode and then disable all add-ins. Once disabled, export the OST data to PST for backup.
To open MS Outlook in safe mode,
Microsoft Outlook comes with an Inbox Repair utility called ScanPST.exe, located in the installation directory of MS Office Outlook. Before Outlook 2013, Microsoft used to provide two inbuilt Inbox Repair utilities to repair issues with Outlook data files.
However, the ScanOST.exe was dropped and replaced by ScanPST.exe. Thus, you can now use the ScanPST.exe tool in MS Outlook 2010 and the above versions to repair both PST and OST Outlook data files.
Follow these steps to find and run ScanOST.exe to repair OST file in MS Outlook 2000, 2002, 2003, 2007, and 2010.
To repair OST file in MS Outlook 2013 and above, follow these steps,
To find the OST file, follow this guide on Where do I find OST File?
WARNING: Although you may try to fix OST file errors by using the ScanOST.exe or ScanPST.exe tool, the utilities can only fix minor errors. Thus, instead of fixing the OST with these Inbox Repair utilities, try to recreate it or convert it to Outlook importable PST file by using Stellar Converter for OST.
The software converts OST files to PST in a few clicks, with 100% precision and accuracy. It also recovers deleted mailbox items from the OST file and provides you the recently available data from the OST file.
But before renaming the file, quit the MS Outlook. Otherwise, you may see errors. Now, locate the OST file on your machine.
Note: To rename the OST file, you must know the OST file location. Refer to this guide and find the OST file location in MS Outlook 2007 and above versions.
Once you found the OST file, follow these steps to rename the file,
After renaming the OST file, open the MS Outlook. It will recreate the new OST file automatically and you won’t see any OST errors.
NOTE: This works only if your Exchange profile is active and connected to the server. If your profile is deleted or disabled from the Exchange server, Outlook will fail to recreate the OST file.
Hope you’re able to fix the errors detected in the OST file by following one of the above-mentioned methods. However, if none of the methods work, you can convert OST to PST by using Stellar Converter for OST. The software converts the OST file to Outlook importable PST file safely and accurately. Once converted, you can import the PST file into Outlook via Import Export wizard, which will ultimately resolve the OST file errors and let you access your mailbox items.
You can also save the OST data to other formats, such as EML, MSG, PDF, RTF, and export the data from the OST file to Live Exchange or Office 365 accounts by using Stellar Converter for OST - Technician version. Download the free demo version now and do-it-yourself.
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