Whereas accessing the mailbox folders, increasing a shared folder, or accessing some secondary mailbox, chances are you’ll encounter the “Unable to expand the folder, Client operation failed” error. Normally, error messages like “Cannot expand the folder” or “Unable to expand the folder” happen on Outlook Trade accounts. When you see this error message in Outlook, you possibly can strive the options supplied on this submit.
Unable to expand the folder, Client operation failed
The next options might assist you to repair this drawback in Outlook:
- Verify the standing of the Cached Trade Mode
- Grant Full Entry permission to the mailbox
- Troubleshoot Outlook in Protected Mode
- Restore corrupted OST and PST recordsdata
- Use the Microsoft Help and Restoration Assistant device
Let’s see all these options intimately.
1] Verify the standing of the Cached Trade Mode
The Cached Trade Mode supplies customers with a greater expertise once they use an Trade account. When this mode is enabled, a replica of your mailbox is saved in your pc. This not solely permits you to shortly entry your information but additionally updates information incessantly with the server that runs Microsoft Trade.
You could be experiencing this subject due to the disabled Cached Trade Mode. Verify if this mode is enabled or not. When you discover it disabled, allow it. Whether it is already enabled, disable it after which allow it once more. The next directions will information you on this:
- Open Microsoft Outlook.
- Go to “File > Account Settings > Account Settings.”
- Choose Trade or Microsoft 365 and click on Change.
- Underneath the Offline Settings, see whether or not the “Use Cached Exchange Mode” checkbox is chosen or not. If not, choose it. If the checkbox is already chosen, deselect it and exit Outlook. Now, begin Outlook once more and switch this function on.
Now, test in case you can expand the folders or not.
2] Grant Full Entry permission to the mailbox
One other reason for this drawback is the permission subject. In Outlook Trade and Outlook 365, you may make delegates open and browse the electronic mail messages of one other account assigned to them. The delegates will get the “Unable to expand the folder” error message whereas increasing the folders of the shared inbox if Full Entry permission isn’t granted to the mailbox.
To resolve this subject, you may have to grant Full Entry permission to the mailbox. Granting Full Entry permission to the mailbox will enable the delegates to open the mailbox and consider, add, and take away the contents of the mailbox. But it surely doesn’t enable the delegates to ship the messages from the given mailbox. Do observe that, in case you assign the Full Entry permission to the mailbox that’s hidden from the tackle listing, the delegates won’t be able to open that mailbox.
The next steps will assist you to:
- Log into your Trade Admin Middle.
- Open the listing of Mailboxes and choose the mailbox, the permission of which you need to change.
- Now, click on on the Handle permission delegation hyperlink underneath the Mailbox permissions.
- Click on on the Edit button subsequent to Learn and handle.
- Click on Add permissions.
- You will note the listing of customers together with their electronic mail IDs. Choose the consumer to which you need to assign the Full Entry permission of the mailbox.
- Click on Save.
3] Troubleshoot Outlook in Protected Mode
One other reason for the drawback is a conflicting add-in. To test if that is the case with you, open Outlook in Protected Mode and see in case you can expand the folders or not. In the Protected Mode, add-ins stay disabled. If the subject doesn’t happen in the Protected Mode, you may have to establish the problematic add-in.
To establish the problematic add-in, shut Outlook in Protected Mode and launch it in regular mode. Now, observe the steps written under:
- Go to “File > Options.”
- Click on Add-Ins on the left aspect.
- Choose COM Add-ins in the Handle drop-down and click on Go.
- Uncheck one among the checkboxes and click on OK. This motion will disable that specific add-in.
- Verify if the subject seems.
Repeat the above steps till you discover the problematic add-in. As soon as you discover it, take away it from Outlook.
4] Restore corrupted OST and PST recordsdata
If the OST and PST recordsdata in Outlook get corrupted, you’ll expertise a number of points in Outlook. To repair the drawback, restore the corrupted OST and PST recordsdata.
5] Use the Microsoft Help and Restoration Assistant device
The Microsoft Help and Restoration Assistant device runs some checks in your system to discover out the reason for the drawback and provides the greatest resolution to repair the drawback. You need to use this device to repair Microsoft Workplace, Microsoft Workplace 365, and Outlook issues. The device is obtainable on the official web site of Microsoft without cost. Obtain and use this device and see if it helps.
Learn: Outlook Can’t ship this assembly request.
Why can’t I expand the folder pane in Outlook?
One in all the causes of being unable to expand the folder in Outlook is the permission subject. It’s vital that the shared mailbox ought to have Full Entry permission in order that the delegate might be in a position to open it and browse the emails. Other than that, this drawback additionally happens if the Cached Trade Mode is disabled or turned off. You also needs to test if there’s a conflicting add-in by launching Outlook in the Protected Mode.
How do you repair Can’t expand the folder, the set of folders can’t be opened, the try to go browsing to Microsoft Trade has failed?
When you see the “The set of folders cannot be opened” error in Outlook, you possibly can strive some fixes, like resetting the Navigation Pane in Outlook, disabling your Outlook add-ins, reducing the measurement of your mailbox, eradicating and including your account once more, and many others.
Hope this helps.
Learn subsequent: Despatched Objects Folder lacking or not present in Outlook.
