10 Tools to Recover a Lost or Forgotten Outlook PST Password in 2026

Outlook asks for a PST password you’ve lost or forgotten, blocking the mail archive when you try to open it. That old archive may have caught your eye out of curiosity, but back it up before trying the quickest free option.

Fix #1: Back up the PST and try NirSoft PstPassword

NirSoft PstPassword is a free, portable Windows utility. It can return up to three candidate passwords, and any one of them may open the PST even if it doesn’t match your original password.

The tool was designed for older Outlook releases. It can detect PST files associated with newer installations, but NirSoft doesn’t guarantee compatibility with every current Outlook configuration.

1. Open classic Outlook.
2. Select File > Account Settings > Account Settings.
3. Open the Data Files tab.
4. Note the path beside the locked PST.
5. Close Outlook.
6. Copy the PST to an external SSD, USB flash drive, or another folder with enough free space.
7. Download and extract PstPassword from NirSoft.
8. Run PstPassword.exe.
9. Drag the copied PST into the PstPassword window if it isn’t detected automatically.

10. Try each displayed candidate when Outlook requests the password.

You should see the archive appear in Outlook’s folder pane after one candidate works. PstPassword is the first tool I’d try because it’s free and doesn’t alter the original file.

Fix #2: Remove the password with SysTools PST Password Remover

SysTools PST Password Remover removes password protection instead of trying to reveal the exact password. The vendor lists support for multiple Outlook versions and current Windows systems.

The download may operate as a limited demo. Check what the trial can save before paying.

1. Keep Outlook closed.
2. Install and open SysTools PST Password Remover.
3. Use the current interface’s file-selection control to add your backup PST.
4. Select the option for removing its password.
5. Choose a different folder for the output file.
6. Start the removal process.

7. Wait for the completion message before closing the utility.
8. Open classic Outlook.
9. Select File > Open & Export > Open Outlook Data File.
10. Select the unlocked copy.

The new PST should open without a password prompt. Confirm that several folders and messages load before deleting any temporary files.

Fix #3: Remove or reset the password with MailsDaddy

MailsDaddy PST Password Remover can remove a PST password or replace it with one you choose. It works as a standalone Windows application, so Outlook doesn’t need to be installed during processing.

1. Install and launch MailsDaddy PST Password Remover.
2. Select Add File.
3. Choose the backup PST.
4. Preview a few folders if the program displays their contents.
5. Select Remove to create an unprotected PST.
6. Select Reset instead if you want to assign a new password.
7. Enter and confirm the new password when resetting.
8. Choose an output location on a local drive.
9. Start the operation.

10. Wait for the success confirmation.
11. Open the resulting PST through File > Open & Export > Open Outlook Data File.

Outlook should open the saved copy without a prompt or accept the new password. The remove-or-reset choice is nicely done, especially when you plan to keep using the archive.

Fix #4: Process several PST files with Cigati

Cigati PST Password Recovery Tool supports recovering, removing, or resetting PST passwords. Its multi-file workflow is useful when you’ve inherited several protected archives.

1. Install and open the Cigati utility.
2. Add the copied PST files you own or are authorized to access.
3. Choose the recovery, removal, or reset operation.
4. Enter a new password if you selected reset.
5. Choose where the processed files will be saved.
6. Start the operation.

7. Wait until every file shows a completed status.
8. Open each output PST separately in Outlook.

Each processed archive should open with the recovered candidate, without protection, or with its newly assigned password. Keep the originals until you’ve checked every folder.

Fix #5: Recover a password with BitRecover

BitRecover PST Password Recovery Tool is listed through Microsoft Marketplace. Its product information includes support for large PST files and current Outlook and Windows environments.

A multi-gigabyte PST may take longer to process. Store the output on a drive with enough room for another complete copy.

1. Install and open BitRecover PST Password Recovery.
2. Add the backup PST through the program’s file-selection control.
3. Confirm that the displayed path points to the copy.
4. Start the password-recovery operation.

5. Leave the computer running until the operation finishes.
6. Copy the recovered candidate password.
7. Open the PST in Outlook.
8. Paste or type the candidate when prompted.

The archive should appear in Outlook’s folder pane. If BitRecover creates an unlocked copy, open that output file rather than the protected original.

Fix #6: Try SysInfo PST Password Recovery

SysInfo PST Password Recovery is a Windows utility for lost or forgotten PST passwords. Its current product page describes support across several Outlook releases.

1. Close Outlook.
2. Install and launch the SysInfo tool.
3. Add the backup PST.
4. Select the available password-recovery action.
5. Start the scan.

6. Wait for the result window.
7. Save or copy the candidate password if the trial permits it.
8. Open the original backup in Outlook.
9. Enter the recovered candidate.

Outlook should mount the archive if the candidate is accepted. If the demo hides part of the result, review the license terms before purchasing.

Fix #7: Use Recoveryfix for a guided recovery

Recoveryfix PST Password Recovery Manager is another commercial option listed through Microsoft Marketplace. Its guided interface may suit readers who want fewer manual choices.

1. Install and open Recoveryfix PST Password Recovery Manager.
2. Select the backup PST.
3. Start the recovery operation offered by the current version.
4. Wait for the result.

5. Copy the recovered candidate or save the processed PST, depending on the result.
6. Open the corresponding file in Outlook.
7. Enter the candidate password if prompted.

You should see the archive folders populate in Outlook. Check the sender, date, and attachment fields in several messages before treating the recovery as complete.

Fix #8: Create an unlocked copy with RecoveryTools

RecoveryTools PST Password Remover focuses on removing protection from PST files. This approach is useful when access matters more than learning the forgotten password.

1. Close Outlook.
2. Launch RecoveryTools PST Password Remover.
3. Add the copied PST.
4. Select a separate output folder.
5. Start the password-removal operation.

6. Wait for the completion confirmation.
7. Open Outlook.
8. Select File > Open & Export > Open Outlook Data File.
9. Choose the unlocked output.

The processed PST should open without requesting a password. Back it up through your usual cloud backup service after confirming the contents are intact.

Fix #9: Use Passware for a business-critical archive

Passware Kit Standard handles Outlook data file passwords alongside other protected file formats. It makes more sense for professional recovery work than for one small personal archive.

Passware documents the encryption and file types its products support. Processing time depends on the file and protection involved, so don’t assume every job will finish immediately.

1. Confirm that your Passware edition supports the relevant Outlook data file.
2. Install and open Passware Kit.
3. Add the backup PST.
4. Select the supported Outlook password operation.
5. Start processing.

6. Leave the file and output location available until processing ends.
7. Review the reported password or saved result.
8. Open the recovered PST in Outlook.

The file should open with the reported password or as a processed copy. I’d reserve this option for valuable archives where broader recovery controls justify the cost.

Fix #10: Check Top Password only as a fallback

Top Password Outlook Password Recovery was one of the cheaper options in the original tool lineup. Check its current product page for Windows, Outlook, licensing, and refund details before downloading or paying.

I’d skip this step unless the vendor explicitly lists your Outlook version. A current compatibility statement matters more than an old recovery-rate claim.

1. Confirm that the product page lists your Windows and Outlook versions.
2. Read the trial restrictions.
3. Download the installer from the vendor’s product page.
4. Scan the installer with Windows Security.
5. Install and open the utility.
6. Add only the backup PST.
7. Start the supported recovery operation.

8. Try the reported candidate password in Outlook.

The PST should open and display its folders. Stop if the application doesn’t identify your file correctly or requests access unrelated to local PST processing.

Why the recovered password may look unfamiliar

PST password protection uses a weak legacy access-control scheme. Some recovery tools calculate alternative passwords that Outlook accepts instead of revealing the exact text you originally entered.

That behavior is expected. The useful test is whether Outlook opens the archive and reads its contents.

What to do if Outlook still asks for a password

Confirm that you’re opening the processed copy rather than the original PST. Compare its filename and full path under File > Account Settings > Account Settings > Data Files.

If Outlook references the old file, remove that data-file entry without deleting the file. Then open the unlocked copy through File > Open & Export > Open Outlook Data File.

A damaged PST can also trigger trouble after successful password removal. Search Windows for SCANPST.EXE, open Microsoft’s Inbox Repair Tool, and scan the copied PST. Repair the copy only.

PST recovery limits and safety

These utilities target PST files. OST files belong to cached Exchange or Microsoft 365 accounts and require a different recovery path, usually through the account or its administrator.

Use password tools only on files you own or have permission to access. Keep sensitive archives offline during processing, download utilities from their official vendor or Microsoft Marketplace pages, and never overwrite your only copy.

Commercial trials often scan or preview a result without saving an unlocked PST. Read the trial limits first. A polished interface is convenient, but it doesn’t justify paying before the software recognizes your file.

Conclusion

Fix #1 is the winner: NirSoft PstPassword remains a small gem when it recognizes the PST and one of its alternate passwords actually works. For current Microsoft 365 archives, I’d recommend a removal tool that writes a separate copy; repeated errors or missing folders point to PST corruption rather than a password problem.