Microsoft Outlook stores a synchronized copy of your mailbox on your computer in the form of an OST (Offline Storage Table) file. OST files allow users to work offline and sync changes once the connection with the Exchange Server or IMAP server is restored. However, these files are prone to corruption, synchronization issues, and access errors, which can cause Outlook to stop functioning properly. Here I have mentioned best method to fix Outlook OSTfile error in Windows computer using EmailsGuru OST to PST Converter.
What Is an Outlook OST File Error?
An Outlook OST file error occurs when Microsoft Outlook fails to read, open, or synchronize the OST file. This prevents users from accessing their mailbox, sending/receiving emails, or loading Outlook altogether. OST file errors usually appear in the form of:
- Cannot open your default email folders. The file xxx.ost is not an Outlook data file.
- Outlook cannot synchronize folders.
- Errors have been detected in the file Outlook.ost.
- Cannot access OST file – file is corrupted or unreadable.
These errors indicate corruption, sync failure, file mismatch, or server-related issues.
Common Causes of OST File Errors
Understanding the reasons behind OST file corruption helps in choosing the correct recovery method. The most common causes include:
Abrupt System Shutdown or Crashes: Power failures, forced shutdowns, or system crashes interrupt Outlook’s data-writing process, leading to OST corruption.
Network or Server Issues: When Outlook cannot properly sync with Exchange Server or Office 365, OST files become inconsistent or damaged.
Oversized OST File: As OST files grow too large, their performance degrades, increasing the chance of corruption.
Hardware Failures: Faulty RAM, bad sectors on the hard drive, or SSD issues can corrupt OST files.
Malware or Virus Attacks: Malicious software can alter or damage OST file structure.
Add-ins and Third-Party Tools: Incompatible Outlook add-ins often cause sync conflicts and errors.
Manual Methods to Fix OST File Errors
Microsoft offers basic tools like ScanOST (now deprecated) and ScanPST (Inbox Repair Tool) to fix Outlook OST file error However:
- They repair only minor structural errors.
- .They cannot recover severely corrupted or orphaned OST files.
- They do not restore deleted mailbox items.
- They cannot convert OST to PST.
- They fail if the OST file is large or encrypted.
This is why professionals rely on third-party tools like EmailsGuru OST to PST Converter for complete and safe recovery.
Professional Method to Fix OST File Error
EmailsGuru OST to PST Converter is a powerful and user-friendly tool designed to repair, recover, and convert corrupted, orphaned, or inaccessible OST files into PST format without data loss. It bypasses Outlook/Exchange restrictions and restores all mailbox items instantly. It is fully safe and easy way to fix Ourlook OST file error in Windows computer effortlessly.
Top Features of EmailsGuru OST to PST Converter
Repairs Corrupted and Damaged OST Files: The tool scans the file deeply and restores including Emails, Contacts, Calendars, Journals, Attachments, Notes, Drafts, Deleted Items, etc.
Converts OST Files to PST Format: Converting OST to PST ensures you can import the mailbox back into Outlook easily.
Recovers Orphaned or Inaccessible OST Files: It is very useful when Exchange Server crashes, Outlook profile is deleted and OST file cannot be synced.
Supports Selective Conversion: Choose specific folders or items before conversion.
Maintains Data Integrity: All meta-properties (To, CC, BCC, time, attachments, formatting) remain intact.
User-Friendly Interface: Even non-technical users can perform the repair and conversion in minutes.
Compatibility: Compatible with all versions of Outlook including (Outlook 2003–2024) and Windows OS (Windows 7, 8, 10, 11), Exchange, Office 365 and IMAP-based OST files.
Conclusion
Outlook OST file errors can disrupt your workflow and restrict access to crucial emails. While manual fixes offer limited solutions, the EmailsGuru OST to PST Converter provides a reliable, safe, and professional method to repair or fix Outlook OST files error and convert them into PST format with complete data integrity. If you’re facing issues like “Cannot open OST file,” “Synchronization errors,” or “File corrupted,” using this tool is the fastest way to restore your Outlook data.
