How to Fix Outlook Error “Cannot expand the folder”

When you start Outlook or access to a PST file, you may receive this error “Cannot expand the folder. The set of folders cannot be opened.”  Here are the quick means to help you escape from it.

This error “Cannot expand the folder. The set of folders cannot be opened” can occur to Outlook when the hard disk where the PST file is located has bad sectors, or the file is on a network share, or the file is corrupted. If you are suffering from this error, now read on to learn how to cope with it perfectly.Outlook Error: Cannot expand the folder

Scan & Fix Bad Sectors in Hard Disks

With doubt, if the hard disk where your MS Outlook is installed has bad sectors, this error “Cannot expand the folder” will pop up definitely. Under this circumstance, you can use a free utility coming along with Windows, namely CHKDSK.

  1. For a start, close Outlook and head to “Start Menu”. In the search field, type “cmd”.
  2. After a corresponding program shows up, you should right click it and choose “Run as administrator”.Run cmd as administartor
  3. Then in Command Prompt, you can input “chkdsk diskname: /f” and press “Enter” keyboard button.
  4. Next, if you force it to check the system disk where Windows is installed, it will ask you whether to schedule a disk check next time Windows reboots. If you just need to check other data drives, it will work immediately.Check system disk next time the system restarts
  5. Finally after fixing the bad sectors in the hard disk, you can restart Outlook to see if the error has gone away.

Don’t Connect to a PST File on a Network Share

Furthermore, many users encounter this error, owing to the fact that they are trying to connect to the PST file which is located on a Network share. But Microsoft Outlook doesn’t support this. It will pose poorer performance, Outlook Data corruption and even thorough data loss.

You should bear in mind that PST files are not a long-term approach to store messages in an enterprise environment. Therefore, you have to always keep the PST file to local and then connect to the Outlook application.

Check & Repair PST File by ScanPST

Another crucial factor is that your PST file is corrupted, which gives you no alternatives but to repair the file. In this scenario, the first choice coming into your mind must be Outlook Inbox Repair Tool, ScanPST.Check & Repair PST File by ScanPST

You can find this tool swiftly via searching “Scanpst” in the installation directory of MS Outlook. After running it, you can select the target PST file, scan and repair it by following onscreen instructions.

Make Use of other Versatile Tools

Nevertheless, you have to remain prepared for ScanPST failure, because it cannot deal well with the complicated errors or severely botched up PST file. Therefore, when it cannot succeed, so as to salvage your cherished Outlook data, you ought to think about other solutions. Unquestionably, one of them is to procure a versatile tool like DataNumen Outlook Repair. It can scan PST file and find out the errors in a jiffy, thereby minimizing the data corruption or loss without breaking a sweat.

Author Introduction:

Shirley Zhang is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including sql recovery and outlook repair software products. For more information visit

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