How to Fix Cannot Expand Folder Error in Outlook?

When you expand a mailbox or public folder in Microsoft Outlook or click Address Book on the toolbar, you may receive the following error: Outlook Cannot Expand The Folder. The Set of Folders Cannot Be Opened. And then the outgoing mail may become stuck in the Outbox folder and may not be sent until you restart Outlook. If you are going through the same issue then, this blog is for you, as here we have compiled some solutions to Fix Cannot Expand Folder Error in Outlook.

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