Most users face the error message "OST is not an Outlook data file" when they use Microsoft Outlook. Users encounter this problem because they attempt to open or import or directly access an Offline Storage Table (OST) file. Users of Outlook face challenges because OST files depend on the Outlook profile and Exchange account which prevents their independent opening like PST files. Datavare OST to PST Converter The guide will explain the error reasons which lead to this problem and present methods to fix it.
What Causes the “OST Is Not an Outlook Data File” Error?
The causes of this error require explanation before solutions can be presented to users.
Corrupted OST File – The file gets damaged because of improper shutdowns and system crashes and virus attacks.
Profile Mismatch – The OST file belongs to a different Outlook profile or Exchange account.
File Header Corruption – The OST file has internal structure damage which affects its core function.
Exchange Server Disconnection – The Exchange account becomes unreachable after its deletion.
The User Imported OST File Through The Incorrect Method By Attempting To Import From Outlook.
Effective Ways to Resolve the Error
1. Verify the File Location
You need to choose the correct OST file which you want to select. The default location of OST files is:
C:\Users\Username\AppData\Local\Microsoft\Outlook
Outlook will not recognize the file when its original location has been changed.
2. Recreate the Outlook Profile
The problem will be solved when you create a new Outlook profile because it will allow you to create a new profile:
Open Control Panel.
Click on Mail.
Select Show Profiles.
Click Add and create a new profile.
The system requires you to set up your email account once more.
Outlook will create a new OST file which it will use to synchronize with the server.
3. Use Inbox Repair Tool (ScanPST)
Microsoft provides a built-in repair tool called ScanPST.exe:
You need to find ScanPST.exe which is located in the Outlook installation directory.
You need to find and choose the OST file.
You need to press Start for the scanning process to initiate.
The system will fix all errors which it detects.
This tool serves better when dealing with minor corrupt areas but it cannot restore severely damaged files.
4. Disable Cached Exchange Mode
The process of turning off Cached Exchange Mode in combination with turning it back on will refresh the OST file.
Open Outlook.
Go to File > Account Settings > Account Settings.
Select your account and click Change.
Uncheck Use Cached Exchange Mode.
The user needs to restart Outlook followed by re-enabling the feature.
Outlook will recreate the OST file through this process.
5. Convert OST to PST Using a Professional Tool
The manual methods of handling OST files become ineffective when the file is orphaned or severely damaged. The professional conversion tool should be used as the most secure solution when handling these situations. The Datavare OST Recovery solution allows users to convert inaccessible OST files into PST format without data loss.
The software enables you to perform the following recovery actions:
You can retrieve your emails and contacts and calendars and all email attachments.
You can convert OST files to PST and MBOX and EML and different file formats.
The system will preserve all folder structures and their accompanying metadata.
The system can handle OST files that exceed regular size limits.
This method is especially useful when the Exchange server is permanently unavailable.
Preventive Tips to Avoid OST Errors
You should follow these tips to prevent future error occurrences:
Always close Outlook properly.
Maintain a stable internet connection while syncing.
Users need to perform regular updates for both Windows and Outlook.
The antivirus program should remain active throughout the entire system.
All essential mailbox data must be backed up into PST format.
When Should You Choose Professional Software?
You should get a professional solution when these conditions are present:
The OST file is orphaned.
The file remains unrepairable after ScanPST attempts to fix it.
The Exchange account is deleted.
You need to migrate data to another platform.
Using a trusted tool reduces risk and ensures complete data recovery.
Conclusion
It is an orphaned OST file. Despite ScanPST's efforts, the file cannot be repaired. The Exchange account has been removed. Data must be moved to a different platform. Complete data recovery is ensured and risk is decreased by using a reliable Software. In conclusion Because it blocks access to important emails, the "OST is not an Outlook data file" issue causes problems. The issue will be resolved by determining its underlying cause and putting appropriate solutions in place, such as file conversion and repair and profile regeneration. When manual procedures fail, automated technologies offer dependable paths for data recovery. Implementing preventive steps and performing regular backups will safeguard your Outlook data because they shield your system from potential issues.
