How to Repair a Corrupted Outlook PST File Without Losing Emails?

It’s possible to repair Outlook PST file corruption without losing emails by checking for errors and repairing them with the help of the Inbox Repair Tool. A corrupt PST file doesn’t necessarily mean that you’ll lose your important emails. You just need to know the best methods to repair your PST files quickly. We’ll be discussing the reasons, signs, and top ways to repair damaged Outlook PST files.

What are the reasons for PST file corruption?

Here are some of the most common reasons behind PST file corruption:

·         Oversized PST files: Modern UNICODE PST files have a size limit of up to 50GB data. If the PST file exceeds the set size limit, it can impact Outlook’s performance and cause sudden crashes during read/write operations.

·         Sudden crash: Outlook shutting down improperly or crashing mid-operations can break the internal structures of the PST file.

·         Damaged storage device: Bad sectors on the storage device or failing drives can corrupt the saved PST file.

·         Network storage: Storing PST files over shared or local networks can give rise to synchronization errors and corruption.

·         Conflicting add-ins: Sometimes, conflicting third-party add-ins can interfere with Outlook’s read and write operations and corrupt the data file’s internal structure. This can damage the data file severely.

·         Virus/malware attack: If you’ve recently suffered from a virus/malware attack, it can encrypt or severely damage your data file.

Signs of corruption in PST file

Some common signs of corruption in PST files include:

·         Outlook crashes shortly after launching.

·         Folders vanish completely or won’t load in the mailbox.

·         Error message “Cannot open your default email folders. The file path.pst cannot be opened” is displayed in Outlook.

How to repair Outlook PST file corruption without losing emails?

ScanPST.exe, otherwise known as the Inbox Repair Tool, is a built-in utility developed by Microsoft that can scan PST files for errors and repair minor levels of corruption. It’s installed in every system automatically when Outlook is installed, but the location differs based on what’s your Office version and whether it’s 32-bit or 64-bit. The location of ScanPST.exe for Office 32 and 64-bit is:

·         Outlook 2016 / 2019 / 2021 / Microsoft 365 (64-bit): C:\Program Files\Microsoft Office\root\Office16\

·         32-bit installs on 64-bit Windows: C:\Program Files (x86)\Microsoft Office\root\Office16\

Once you’ve located ScanPST.exe on your system, follow the steps below to scan and repair PST file:

·         Close all instances of Outlook from the background.

·         Launch ScanPST.exe and click on Browse to add your PST file.

·         Make sure the “Make backup of scanned file before repairing” option is ticked.

·         Click on Start to proceed with the scan process.

·         Once errors are found in the file, repair the PST file. Open Outlook again to check if the file is repaired or not.

What if ScanPST.exe is unable to fix it?

If the PST file is severely corrupted or has irreparable structural damage, ScanPST.exe won’t be able to repair the data file in that case. Try these fixes if you’re unable to repair the file:

·         Check the .bak backup file: Check the backup file ScanPST.exe created during the repair process. There’s a chance that the backup file contains some important items that the Inbox Repair Tool was unable to recover.

·         Opt for a dedicated software: If ScanPST.exe fails, a dedicated PST repair tool can be viable option to repair Outlook PST files that are damaged.

How to prevent corruption in PST files?

To prevent PST corruption in future, you can keep the given things in mind:

·         Make sure that PST files don’t exceed the set size limit.

·         Do not store PST files on a local or shared network.

·         Don’t force-close Outlook, especially during a read/write operation.

·         Disable unnecessary add-ins that are no longer required.

Final words

Well, there’s no one reason for PST file corruption. It’s usually a cumulative result of many small errors piling up. Also, it’s not necessary that you’ll lose your emails if your PST is corrupted. Just check the level of corruption in the PST file and then try repairing it with the Inbox Repair Tool. Also make sure that you take regular backups of your mailbox data to avoid data loss.

Frequently asked questions

Q1. Can a corrupted PST file be repaired without losing data?

A. Usually, yes. If the level of corruption isn’t too severe, the PST file can be repaired without losing any mailbox data.

Q2. Where is scanpst.exe located?

A. It's installed along with Outlook, usually in “Program Files\Microsoft Office\root\Office16” (64-bit) or “Program Files (x86)\...” for 32-bit installs.

Q3. Is it safe to run ScanPST on an OST file too?

A. Yes. ScanPST works on both PST and OST files, though for OST files you can often just delete the file and let Outlook resync from the server instead.

Q4. What's the PST size limit in modern Outlook?

A. Unicode-format PST files (the default since Outlook 2003) support up to 50GB, it’s suggested that users stay well below this limit for effective Outlook performance.